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39 page 40 page 42 page 46 Optics page 50 page 53 science ® 40 Optics 2946.00 Optical bench Base for optical bench Stable optical bench offering a convenient way of carrying out optical experiments as well as different experiments with radioactive sources. The bench is made of black-anodized aluminium and equipped with ruler on the side. Supplied with the following standard equipment: 2946.30 Base for optical bench (single) – 2 sliding saddles (no. 2946.20) with Ø 10 mm hole for fixing various equipment. – 1 sliding saddle (no. 2946.20) for optical disc. – 2 bases with rubber pads and levelling screws (no. 2946.30). Total length 1000 mm. Cross section 26 x 82 mm. Base with rubber pads and two levelling screws, in black anodized aluminium. Length: 125 mm, Height: 50 mm, Width: 25 mm. Extension sections for optical bench Black-anodized extension section for the optical bench 2946.00 Equipped with a ruler. Base (2946.30) is not included. 2946.40 Section for optical bench 600 mm 2946.45 Section for optical bench 1000 mm 2946.46 Section for optical bench 2000 mm 2946.00 Optical bench Joint Link for optical bench Sliding saddle Joint link in black-anodized aluminium with degree scale for coupling of the optical bench to the extension section. For optical bench 2946.00. For fixing of optical equipment with max. 10 mm diameter fixing rod. Made of black-anodized aluminium with thumb screw and measuring line. Dimensions: 35 x 50 x 84 mm. 2946.10 Sliding saddle 2946.50 Joint link for optical bench Profiled rail Short section of the same profile as used in the optical bench – without ruler, base and sliding saddles. Length 370 mm. 2946.35 Profiled rail Sliding saddle for optical disc As 2946.10 but with the hole off-centre. Needed for 2900.00 optical disc. (Also used in 5142.00 muon observatory.) 2946.20 Sliding saddle for optical disc 2946.10 2946.40 2946.35 2946.20 2946.50 2946.10 ® 2946.30 (x2) science optics 41 Student Reuter lamp This simple, high intensity light is very suitable for experiments with lenses, prisms and optical gratings. The light source itself is a small festoon lamp with the filament aligned with the supporting rod making it easy to position on an optical bench. The long, narrow filament is ideal for performing experiments with lens optics and gratings. The lamp housing is supplied with a cooling fan which keeps the housing cool enough to touch even though the lamp is rated at 15 watts of electrical power. 2800.30 Student Reuter lamp 2800.30 2800.50 Experiment lamp This lamp emits a bright beam of light, ideal for many types of experiments and demonstrations. Focus and filament position are easily adjusted. Provided with safety jack connectors and a Ø 10 mm mounting rod for use on an optical bench or with a laboratory stand. A 50 W halogen lamp is included. During operation the lamp housing is ventilated by means of a built-in ventilator, so the surface temperature of the housing will not exceed 60 °C. The Reuter Lamp has both a bi-pin socket for halogen lamps 12 V/50 W (item no. 4270.10) and a bayonet socket for 12 V/35 W lamps (item no. 4265.40). Length: 310 mm. Width: 76 mm. Height: 105 mm (excluding mounting rod). Power supply needed: 12 V AC/DC, minimum 3 A (35 W lamp) or 4.2 A (50 W lamp). 2800.50 Experiment lamp Aperture holder for experiment lamp Holder for apertures, colour filters, etc. The aperture holder fits the lens mount of the experiment lamp. It is rotatable and can be used for apertures or filters mounted in standard slide frames. 2800.55 Aperture holder 3055.00 3055.10 Ground glass screen Made of Plexiglas. Height 250 mm, width 250 mm, with 10 mm fixing rod. 3055.00 Ground glass screen White screen In laminated plastic with white surface. Height 250 mm, width 250 mm, with 10 mm fixing rod. 3055.10 White screen science 2800.55 ® 42 Optics Lenses and apertures Lenses in holder For use with the optical bench. Lens diameter 50 mm. Mounted in rectangular plastic plate 100 x 100 mm with 10 mm stainless steel rod and printed focal length. 2950.10-30 2950.10 2950.20 2950.30 2950.40 Lens Lens Lens Lens in in in in holder, holder, holder, holder, + 300 mm + 100 mm + 50 mm - 200 mm 5760.40 Storage block for 6 lenses 5760.40 2950.40 Iris diaphragm 2960.00 Maximum aperture 28 mm. Black 100 x 100 mm plastic screen with Ø 10 mm fixing rod. 2960.00 Iris diaphragm Lens and slide holder 2902.01 2903.00 A versatile holder made to fix slides max. 50 x 50 mm and Ø 50 mm lenses. Two spring loaded clips allow you to fix up to 16 mm thick lenses and slides. Supplied with a 10 mm diameter steel rod for fixing in an optical bench etc. Overall length 170 mm. 2902.01 Lens and slide holder Set of lenses 50 mm diameter 2946.10 This set of lenses comprises 6 different lenses Ø 50 mm. The lenses can be mounted in lens and slide holder 2902.01. The set of lenses may be used for a number of optical experiments but are also specified to be particularly well suited for laser experiments. A storage box is included. The set comprises lenses with the following focal lengths: Biconvex: 50, 100, 200, 1000 mm. Biconcave: 50 and 100 mm. 2903.00 Set of lenses 50 mm diameter Adjustable slit 3230.00 Slit length 42 mm, width continuously adjustable to a maximum of approximately 9 mm by means of a spring loaded knurled knob. Made of black coloured brass, placed in a black-anodized aluminium square, 150 mm side length with 10 mm steel rod. The adjustable slit can be positioned vertically or horizontally. 3230.00 Adjustable slit ® science optics 43 Slits and filter holder Designed to accept slits and filters etc. 50 mm square of maximum 3.5 mm thickness. Black 100 x 100 mm plastic screen with Ø 10 mm fixing rod. 2950.80 Slits and filter holder 50 x 50 mm optical components 2950.80 All of these are mounted in glass-less slides, unless otherwise noted. 2 Single slits, various widths This aperture consists of five different slit widths for demonstrations of diffraction patterns: 0.04 – 0.08 – 0.14 – 0.20 – 0.26 mm. Size: 50 x 50 mm. 3230.10 Single slits, various widths Double slit Mounted in a slide between two glass plates. Spacing between slits 0.1 mm. 3240.10 Double slit Triple slit Spacing between slits 7 mm, slit width 1 mm. 3010.00 Triple slit Seven slits Spacing between slits 5 mm, slit width 0,8 mm. 3010.05 Seven slit Arrow aperture Slit width 1.5 mm. The slit is shaped like an arrow. 3010.10 Arrow aperture “F” slit Slit width 1 mm. Used in optical experiments; the asymmetrical shape reveals whether the picture is horizontally or vertically inversed. 3010.20 “F” slit Slides with circular aperture 3006.00 Slide, Ø 1 mm hole 3006.10 Slide, Ø 2 mm hole 3006.20 Slide, Ø 4 mm hole Frosted Glass Glass square 50 x 50 mm made of frosted Plexiglas. Fits standard slit support. Well suited to optics experiments. 3010.50 Frosted glass 3010.50 science ® 44 Optics Reflection and refraction Plane mirror Glass mirror, back-silvered with protective coating. Rectangular 180 x 120 mm. 3040.20 Plane mirror Prism table Circular disc Ø 62 mm mounted on Ø 10 mm rod. With adjustable spring loaded clamp to accommodate prisms from 10 to 50 mm high. 2990.00 Prism table 2990.00 3040.20 Mirror, concave and convex Back-silvered Ø 115 mm spherical mirrors 190 mm focal length, mounted back to back in a metal frame. The frame is mounted on a 10 mm rod, length 100 mm. 3065.00 Mirror, concave and convex Prism, equilateral Glass prism with polished faces. Triangle side 34 mm, height 35 mm. 2985.00 Prism, equilateral Newton’s prism As item 2985.00 but with triangle side length 34 mm and height 25 mm. 2985.10 Newton’s prism Glass Prism, right angle Side lengths: 40 mm and 54 mm, height: 40 mm. 2985.15 Glass prism, right angle Set of mirrors, convex/concave Crown glass prism Triangle side 30 mm, height 30 mm. 2985.20 Crown glass prism Two mirrors, one concave and one convex. Fits holder 2902.01. Diameter 50 mm, focal length +/- 100 mm. 3065.00 Flint glass prism Triangle side 30 mm, height 30 mm. 2985.30 Flint glass prism 2903.10 Set of mirrors, convex/concave 2985.00-30 2995.00 Rectangular prism, glass Four-sided prism with polished surface for experimenting with path of rays in plan parallel objects. Dimension: 60 x 20 x 20 mm. 2995.00 Rectangular prism, glass 2903.10 ® science optics 45 Prism, hollow 60° Hollow prism with 3 mm glass sides and a detachable top. Outer length 68 mm. Height 53 mm. For demonstrating refraction in liquids. 3000.00 Prism, hollow 60° 3000.00 8299.00 5459.20 Sugar prism The sugar prism is used for measuring the sugar concentration in liquids, e.g. juice. Using a number of reference solutions with known sugar content one can compare the refraction of light, e.g. a laser beam, of reference samples and an unknown solution. Supplied with complete instructions for student projects and experiments. Sodium fluorescein When hit by shortwave light, fluorescein lights up with a bright yellowish hue. It is useful for showing the path of a light ray in a transparent liquid. Visible light or a blue or violet laser beam can be used. Sodium fluorescein can be supplied either as a powder or in solution. 5459.20 Sugar prism 8298.00 Sodium fluorescein, powder, 50 g 8299.00 Sodium fluorescein, solution, 200 mL Light refraction tank Mirror, rotatable with indicator needle This Plexiglas tank is supplied with plane parallel sides. One of the corners in the bottom is cut off at a 45° angle to facilitate the entry of light rays. It is ideal for optical experiments with refraction and (total) reflection. To make the light rays visible in the water, a small amount of chalk powder can be suspended in the liquid. If the light source is white light or a blue or violet laser like our 1420.95, a little fluorescein will give very good results. To make the rays visible in the air above the water, blow a little smoke into the tank. Size: 370 x 130 x 150 mm. This rotatable mirror is mounted on a stand. Useful for directing the light beam as desired inside the refraction vat. 3025.00 Mirror, rotatable with indicator needle 3025.00 3015.00 Light refraction tank Lid for 3015.00 Needed to keep smoke inside the tank. 3015.10 Lid for 3015.00 3015.00 science ® 46 Optics Geometrical optics Optical disc A 25 cm diameter white faced disc clearly marked at every 5° and with crosshairs at 90° to mark the centre. The disc can be rotated around the centre. The stand provided fits the special 2946.20 sliding saddle. The optical disc is equipped with a holder for optical components from e.g. the 2902.00 optics kit. 2900.00 Optical disc Optics kit 2900.00 A complete set of 19 mm thick acrylic prisms, lenses and mirrors suitable for doing all of the classical optics experiments. Supplied in a partitioned storage box. All the acrylic blocks are made of clear polished acrylic resin free from striae and bubbles. Bottom surfaces are ground to show ray tracks. The kit comprises the following items which may also be supplied separately: 2905.00/20/30/40/50/60 and the mirrors 2908.00 and 2910.00. 2902.00 Optics kit Smoke lenses, set of 4 Optics experiments will never be the same without smoke lenses once you have tried them. Students can see the light as it passes through the lenses. Refraction and internal reflection are observed with a clarity never seen before. Especially well suited for experiments with lasers. The set comprises 4 blocks 20 mm thick made of a special acrylic resin: 2 convex lenses 50 and 100 mm focal length, 1 prism 90°, 45°, 45° and 1 rectangular prism. 2912.00 Smoke lenses, set of 4 2902.00 Acrylic plastic blocks For refraction experiments. Clear 19 mm thick, polished blocks, free from striae and bubbles. Bottom surfaces are ground to show ray tracks. No.Type Dimension 2905.00 2905.10 2905.20 2905.30 2905.40 2905.50 2905.60 90°, 45°, 80 x 56 mm. Equilateral, side 64 mm. 79 mm, radius 205 mm. 79 mm, radius 205 mm. Side 75 x 25mm. 80 mm diameter. Total Length: 100 mm Triangular prism Triangular prism Biconvex lens Biconcave lens Rectangular prism Semicircular lens Trapezoidal prism 2912.00 2908.00 Plane mirror glass, back-silvered, mounted on a hardwood block. Side length 90 mm. 2910.00 Cylindrical mirror. Made of nickel-plated brass. Side length 110 mm. 2905.00 2905.20 2905.30 2905.10 2910.00 2905.60 2905.40 ® 2905.50 2908.00 science optics 47 Candle holder on support stand This candle holder is useful in experiments with image formation using convex lenses. The stand is supplied with a moveable candle holder so that the candle can be placed at just the right height. Height: 65 mm. 2820.00 Candle holder on support stand Candle holder 2820.10 2820.00 This holder is designed for candles (item no. 2810.00). The holder is supplied with a Ø 10 mm rod which fits standard laboratory support hardware. Height: 55 mm. 4130.10 2820.10 Candle holder Lamp holders E14/E27 for mains connection Optical set with light box Very comprehensive set for teaching geometrical optics and mixing of colours. The set is consisting of a light box with a 12V halogen bulb, different lenses, slits, colour filters and mirrors. 24 parts. 2935.00 Optical set with light box Mounted on a 10 mm diameter rod, supplied with cable and 230 V plug. Stand base is not included (shown with 0004.10). 4130.10 Lamp holder E27 4130.20 Lamp holder E14 2935.01 2935.00 science ® 48 Optics Optics set, image formation Lenses mounted in holder with surrounding black screen For student use. 40 mm lenses mounted in rectangular plastic plate 80 x 120 mm with a heavy nickel-plated brass base. Engraved focal distance. Centre height 83 mm. Can be used with light source no. 2800.30, slits and filter holder no. 2970.00. 2965.00 2965.10 2965.20 2965.30 Lens Lens Lens Lens in in in in holder, holder, holder, holder, + 300 mm + 100 mm + 50 mm - 200 mm 2965.00-.30 Slits and filter holder Designed to accept slits and filters etc. of size 50 mm square by a maximum of 3.5 mm thickness. 80 x 120 mm plastic screen with heavy nickel-plated brass base. Centre height 83 mm. 2970.00 Slits and filter holder Glass plate Plane rectangular 180 x 120 mm, 2 mm thick. 3040.00 Glass plate Glass plate, frosted Plane rectangular 180 x 120 mm, 2 mm thick. 2970.00 3040.10 3040.10 Glass plate, frosted 3040.10 3040.20 Plane mirror Glass, back-silvered with protective coating. Rectangular 180 x 120 mm. 3050.00 3040.20 Plane mirror Screen White cardboard plate. Dimensions: 180 x 120 mm. 3040.30 Screen 3040.00-.20-.30 Holder for screens and mirrors In polished 1 mm stainless steel. Width 20 mm, height 40 mm. 3050.00 Holder for screens and mirrors ® science optics 49 Colours 3089.00-.60 Colour filters, foil These transparent coloured foils are supplied in rolls of 50 x 122 cm. These colour filters are reasonably selective and correct compared with the international colour standards. The filters can be cut into A4 format or other appropriate sizes for use on overhead projectors or e.g. 6 x 6 cm sizes for student use. 3089.00 3089.10 3089.20 3089.30 3089.50 3089.60 Colour Colour Colour Colour Colour Colour filter, filter, filter, filter, filter, filter, 3085.00-.30 primary red yellow primary green primary blue cyan magenta 3090.90 Colour filters, acrylic Colour filters produced with 3 mm thick, 50 x 50 mm acrylic plates suitable for use with the aperture supports items 2950.80 and 2970.00. 3085.00 3085.10 3085.20 3085.30 Colour Colour Colour Colour filter, filter, filter, filter, red yellow green blue 3202.00 Coloured filters, 10 pieces Set of coloured filters mounted in slides. Yellow, ruby, blue, red, green, cyan, magenta, purple, mat. 3090.90 Coloured filters Colour disc 3200.00 Made of thick cardboard, Ø 300 mm, with three sets of seven spectrum colours correctly proportioned to appear white when rapidly rotated. 3200.00 Colour disc Whirling apparatus For rotation of colour disc no. 3200.00. Consists of a handle with a spindle and pulley with cord for rotation of spindle. The colour disc is fixed by an 8 mm knurled nut. Length 160 mm, diameter 25 mm. 2025.00 3202.00 Whirling apparatus Motor/generator Our universal 12 V motor is ideal for bringing the colour disc in rotation. Detailed description on page 72. 2025.00 Motor/generator Discs with black/white patterns The set contains two discs. They create the sensation of a colour spectrum when rotated slowly. Disc diameter: 120 mm. The discs can be used with motor/generator 2025.00. 3205.00 3205.00 Discs with black/white patterns science ® 50 Optics Spectral lamps Spectral lamps, Osram A powerful light source for producing line spectra or monochromatic light when used with the appropriate filters. Lamps with 9 pole Pico sockets with external gas glow head for visible spectral emission. Length: 100 mm. Diameter: 20 mm. For mounting inside spectral lamp housing no. 2830.50. 2835.00 Spectral 2835.20 Spectral 2835.30 Spectral 2835.40 Spectral 2835.50 Spectral 2836.10 Spectral lamp lamp lamp lamp lamp lamp 2830.50 2830.60 Na-10 Cd-10 He-10 Ne-10 Zn-10 Hg-100 2835.00-2836.10 2836.50-70 Lamp holder for Osram spectral lamps Spectral lamps with E-27 socket The well known lamp holder for Osram spectral lamps has a built-in cooling fan to keep the surface temperature below 50 °C. Must be used with the control transformer no. 2840.50. (Provided with a Ø 10 mm support rod that fits a threaded hole on the back.) Dimensions: 78 x 78 x 236 mm. A low cost alternative to using the spectral lamps from Osram. These lamps should be used with a special spectral lamp holder (no. 2830.60) as well as a control transformer (no. 2840.50). 2836.50 Spectral lamp with E-27 socket, Na 2836.60 Spectral lamp with E-27 socket, Hg 2836.70 Spectral lamp with E-27 socket, Ne 2830.50 Lamp holder for spectral lamps Control transformer Lamp holder for E-27 spectral lamps Use with our spectral lamp holders – for both Osram and E-27 types. Max. 1 A. Dimensions: Width 185, height 120, depth 220 mm. Ventilated lamp holder for E-27 spectral lamps. Must be used with control transformer 2840.50. Dimensions 78 x 78 x 295 mm 2840.50 Control transformer (230 V) 2830.60 Lamp holder for E-27 spectral lamps 2840.50 ® science optics Spectral tubes Straight pattern, capillary length approximately 70 mm. Fitted with a 6.5 mm diameter contact caps at each end. For observing line and band spectra from various noble and diatomic gasses. For mounting inside spectral tube holder 2855.50 (previous page). 2850.00 2850.10 2850.20 2850.25 2850.30 2850.40 2850.50 2850.60 2850.70 2851.10 2851.20 2851.30 2851.50 2851.80 Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral Spectral tube tube tube tube tube tube tube tube tube tube tube tube tube tube Ne Hg H2 H2 Balmer He Ar O2 Kr N2 H2O CO2 Xe I iodine *) Na and He*) 51 Spectral tube holder and power supply This holder makes the use of spectral tubes easier and safer. The spectral tube is mounted from the front in the insulated holders with electrodes, where the lower holder is spring loaded parallel to the tube axis. The holder is provided with a power supply which can deliver 6 kV DC at max. 2 mA to the electrodes built into the base of the insulated holder. Can be used with spectral tubes 2850.00 – 2851.30 and with many other types of spectral tubes. Dimensions: 78 x 78 x 290 mm. For 220 V AC. 2855.50 Spectral tube holder and power supply 2855.50 2850.00-70 2851.10-80 *) Please note: As the elements iodine and sodium are solid at room temperature, the spectral tubes 2851.50 and 2851.80 will look ”dirty” on the inside of the glass. The sodium may even have formed a cast of the electrode, making it look broken. Normally, these conditions do not affect the function of the tubes. science ® 52 Optics Spectroscopy 2985.20-30 Prisms (equilateral) High quality prisms suited for spectrometer no. 3215.30 to measure spectral lines as well as to determine refractive indices of prisms. Dimensions: side length 30 mm, height 30 mm 2985.20 Crown glass prism 2985.30 Flint glass prism Hand spectroscope, direct viewing This high quality instrument gives bright and sharp spectra, centred in the field of view. The instrument is based on a 600 lines per mm grating and allows observation of both emission and absorption spectra. Overall dimensions: Diameter 25 mm, length 105 mm. 3210.05 3210.05 Hand spectroscope, direct viewing Spectrometer This classical sturdy spectrometer can be used with either a prism or an optical grating. The instrument is provided with an easy to read vernier scale that can be read directly in tenths of a degree. The spectrometer is supplied with a prism and grating holder on an adjustable prism table. The collimator and telescope are fitted with 178 mm focal length 32 mm aperture achromatic objectives. The telescope is fitted with a Ramsden eyepiece and crosshair reticle and a collimator with an adjustable slit. The telescope and collimator mounting arrangement permits accurate levelling of the axes. The spectrometer table, diameter 85 mm, is marked with lines to assist positioning of the prism in relation to the levelling screw, and it has interchangeable clamping units for prism and diffraction gratings. 3215.30 3215.30 Spectrometer ® science optics 53 Diffraction gratings Optical gratings, 24 x 36 mm A grating mounted between two plane parallel plates of glass. Frame area: 50 x 50 mm. These gratings fit the filter holders 2950.80 and 2970.00. Grating area: 24 x 36 mm. 3245.00 Optical grating, 300 lines/mm 3245.10 Optical grating, 600 lines/mm 3245.20 Optical grating, 1200 lines/mm 3245.00-20 Optical gratings, 30 x 45 mm A grating mounted between two plane parallel glass plates. Frame area: 48 x 63.5 mm. These gratings are ideal for the 3215.30 spectrometer. (They will not fit the 2950.80 or 2970.00 filter holders.) Grating area: 30 x 45 mm. 3250.00 3250.10 3250.20 3250.30 Optical Optical Optical Optical grating, grating, grating, grating, 3250.00-30 100 lines/mm 200 lines/mm 300 lines/mm 600 lines/mm Diffraction grating A demonstration slide consisting of three gratings with 100, 300 and 600 lines/mm respectively. Each has an area of 9 x 16 mm. They are mounted between plane parallel glass plates in a cardboard slide 90 x 30 mm in size. 3260.00 Diffraction grating Glass diffraction gratings 3260.00 Glass diffraction grating on a glass carrier. Grating surface approx. 25 x 25 mm. Carrier surface 38 x 50 mm, thickness 4 mm, suited for spectrometer no. 3215.30 3255.05 Diffraction grating 300 lines/mm 3255.10 Diffraction grating 600 lines/mm 3255.05-10 Grating model, set of 4 kits 3244.00 It can sometimes be difficult for students to visualize the optical diffraction grating. Standard gratings have very small gratings constants making the lines invisible to the naked eye. Using machine screws and 0.30 mm nylon line it is possible to produce your own simple optical grating. With a laser beam and a distance of 6 to 10 meters from the grating to a projection screen it is possible to clearly see the diffraction pattern caused by this large spacing grating. This device provides students with a clearly visible example of an operating optical grating. 3244.00 Grating model, 4 kits science ® 54 Optics He-Ne laser The laser emits light with a wavelength of 632.8 nanometres. The emitted light is coherent, i.e. wave fronts propagate in the same phase over a large distance compared with ordinary light sources. The emitted light is highly directional and the beam diameter at the laser is about 0.5 mm increasing very gradually at increasing distances from the laser. The light emitted is not uniformly polarized but changes its polarization at random around the direction of propagation. Light from the laser is ideal for demonstrations of optical interference. If a line grating is placed in the laser beam, the interference pattern will be clearly visible on a projection screen. The laser can be used for a wide range of applications in optics, communication etc. 2885.00 2885.00 He-Ne Laser, max. 1 mW 2885.10 He-Ne Laser, max. 2 mW 2885.20 He-Ne laser, modulated Like 2885.00 but with the option of amplitude modulating the light. The laser is provided with a BNC connector for connection to a function generator, CD-player or similar signal source. Photodetector 4895.50 is a perfect match for demonstration of optical communication. Maximum modulation frequency: 1 MHz 2885.20 He-Ne laser, modulated, max. 1 mW Laser objective Needed when the laser beam is too narrow. Together with e.g. an F = 100 mm lens this convex lens is useful for illumination of a larger area of a diffraction grating or a slide with slits. The objective is supplied with a threaded adapter for mounting to the laser’s optics adapter. 0768.86 0768.86 Objective 10x achromatic, N.A. 0.25 Laser pointers Easy to use pencil sized diode laser pointers. Runs on batteries. Can be used in interference experiments as well as in geometrical optics. Optical power is less than 1 mW (class II) 1420.70 Laser pointer, red (670 nm) 1420.80 Laser pointer, green (532 nm) 1420.95 Laser pointer, violet (405 nm) Powerful laser pointers These laser pointers are class IIIa and are not recommended for students. 1420.75 Laser pointer class IIIa, orange (594 nm) 1420.85 Laser pointer class IIIa, blue (473 nm) 1420.75 1420.70-80-95 1420.85 ® science 55 optics Photodetector The photodetector is provided with a photo diode which gives off an electrical signal proportional with the light intensity. The signal can be applied to the built in loudspeaker or be used for measurements via the AC and DC output connections. The photodetector can be used for demonstrating communication over a laser beam, fibre optic communication, plotting of interference patterns, etc. The maximum frequency is 1 MHz. 4895.50 Photodetector 4895.50 Fibre optics Set For demonstration of optical communication with laser and photodetector. Comprises items 2887.00, 2886.10 and 4885.51 described below. 2886.50 Fibre optics Set Optical fibre This flexible optical fibre guides light rays along curved paths from one place to another. It can be readily cut to the desired length. It can be used in electronics, models, data transfer projects, etc. The external diameter of the fibre with protective covering is 2.2 mm, while the optical fibre itself is 1 mm in diameter. 2887.00 2887.00 Optical fibre, per meter Optical fibre holder This threaded adapter has a centring hole and is designed for optical fibre item no. 2887.00. The cable is secured and centred by means of an O-ring. 2886.10 Optical fibre holder Holder for optical fibre for photo detector 4885.51 2886.10 Fits the photo detector 4885.50 and the optical fibre 2887.00 4885.51 Holder for optical fibre for photo detector Laser diffraction kit This kit comprises 18 slides which allow performance and demonstration of e.g. Fraunhofer Diffraction, Fresnel Diffraction, a number of other diffraction experiments. 3272.00 – Six slides with 1 to 6 slits. Width 0.06 mm, distance 0.20 mm – Slide with holes, Diameters 0.3 – 0.4 – 0.6 – 1.0 mm – Three slides with coarse gratings – Two slides with fine diffraction gratings (80 and 300 lines per millimetre) – Slide with a fine metal gauze (300 mesh) – Slide with a tapered single slit – Slide with a tapered double slit – Two slides with polarizing filters – Slide with a transmission hologram The slides are labelled and come in a storage box complete with an inventory list and brief experiment notes. 3272.00 Laser Diffraction kit science ® 56 Optics Ultraviolet radiation Ultraviolet light - properties and hazards This equipment has been designed to illustrate the many interesting properties of ultraviolet light using protective film, clear film, ordinary glass and a Schott UV filter. Also useful for investigating skin protective sun cream. UVA lamp This UVA lamp emits both spectral light (4 lines from the mercury spectrum) and a band of UV light in the range from 350 nm to 400 nm. The UV lamp is supplied with an ordinary power plug (for direct connection to mains power). Dimensions: 190 x 75 x 75 mm. 2871.00 UVA lamp 3075.00 The set comprises: – UVA lamp no. 2871.00 – UVA probe no. 2872.00 – Accessory kit no. 2872.10 with filters and other materials including fluorescent and phosphorescent plates. Complete instructions included. SAFETY NOTE: The light source is a UVA lamp emitting most UV radiation in the range 350-400 nm with a maximum around 370 nm. These wavelengths pose a minimum risk to eyes and skin, and the radiation does not generate harmful ozone. 2871.50 Ultraviolet radiation set Additional equipment needed Zinc sulphide screen This phosphorescent screen will exhibit light emission some time after is has been illuminated by ultraviolet light. The screen can thus be used to confirm that UV light is present in a light source. Can be used with UV accessory kit 2872.10, UV lamp 2871.00 and UV Probe 2872.00. Screen size: 110 x 105 mm. Mounted in a holder with a Ø 10 mm stainless steel rod. (Stand base is not provided.) 3075.00 Zinc sulphide screen 2515.60 battery box 3867.50 demonstration multimeter or any digital multimeter, e.g. 3862.15. 2871.50 ® science optics 57 Phosphorescent plate Like 3075.00 but measures 70 x 95 mm. Unmounted. 3076.00 3075.10 Phosphorescent plate 3075.10 Fluorescent plate This plate exhibits fluorescence when exposed to ultraviolet light. In contrast to phosphorescent materials where visible light emission persists some time after exposure to the UV, fluorescent materials re-emit visible light only during exposure. It can be used to demonstrate this phenomenon and to show how some materials e.g. UV film in Accessory Kit 2872.10 filter out UV light. Size: 70 x 95 mm. 3076.00 Fluorescent plate UVA-accessories UVA accessories consisting of standard glass plate, fluorescent plate, phosphorescent plate, UVA filter, UVA plastic film and normal plastic film. 2872.10 UVA-accessories 2872.10 2872.00 UVA sensor, directional Useful for investigating emission from the sun, halogen lamps, solarium lamps etc. The well-defined bandwidth 370 nm +/- 5 nm is ensured by a narrow band filter. The sensor is provided with a 5-pole DIN connector and requires a +5 V DC power supply. The sensor can be connected to a data logger or to an ordinary voltmeter via battery box no. 2515.60. Dimensions: Ø 24 x 99 mm. 2872.00 UVA sensor, directional science ® 58 Optics Polarizing filters Unmounted. Dimensions 50 x 50 mm. Pair. 3270.00 Polarizing filters 3270.11 3270.00 Polarizing filter Sheet of unmounted polarizing filter, A4. Can be cut with scissors. 3270.11 Polarizing filter Apparatus for the study of light energy Used to determine the energy efficiency of an incandescent lamp. Apart from the lamp, the container contains a resistor (with the same resistance as the lamp). The container is filled with water and the amount of energy that is converted into heat is calculated from the temperature increase of the system. The part of the electric energy that doesn’t heat the water must have radiated away from the system. Dimensions: Height 120 mm, diameter 70 mm. 3207.00 Apparatus for light energy 3207.00 The polarizing filters are supplied with a protective film on both sides. Remove before use. Lux meter YF 1065 This digital lux meter is a robust and handy item provided with a separate safe-sealed photodetector for maximum stability. The photodetector has good spatial response and will thus respond to illumination from all directions. An analog output signal is provided for connection a data logger. This is useful when experimenting e.g. with photosynthesis. Supplied complete with a battery and a convenient carrying case. Measuring ranges:0-200 lux, 0-2000 lux, 0-20000 lux. The angular response follows the cosine response with the following deviations: 30°: < ±2%. 60°: < ±7%. 80°: < ±5%. Provided with a “hold” function for convenient measurement. Analog output: Jack connections (4 mm). Size, instrument: 119 x 64 x 26 mm. Photodetector: 125 x 66 x 36 mm. 1888.20 Lux meter YF 1065 1888.20 ® science