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Refraction of Light
... direction of light beam changes • The best results obtained by lenses: piece of glass with spherical surfaces • Two main groups: - those that converge light rays (like concave mirrors) - those that diverge the light rays (like convex mirrors) • Converging and Diverging lens • Characteristic points a ...
... direction of light beam changes • The best results obtained by lenses: piece of glass with spherical surfaces • Two main groups: - those that converge light rays (like concave mirrors) - those that diverge the light rays (like convex mirrors) • Converging and Diverging lens • Characteristic points a ...
Solar System
... Brightness • For two stars of the same luminosity with one star double the distance of the other from the Earth the closer star will look four times brighter. D ...
... Brightness • For two stars of the same luminosity with one star double the distance of the other from the Earth the closer star will look four times brighter. D ...
Lens Diameter
... Gravitational lensing has different categories; Einstein rings and multiple images of stars are cases of strong gravitational lensing. MACHOs, MAssive Compact Halo Objects, are objects that create microlensing effects. Microlensing occurs when a MACHO gets between us and a distant star, but instead ...
... Gravitational lensing has different categories; Einstein rings and multiple images of stars are cases of strong gravitational lensing. MACHOs, MAssive Compact Halo Objects, are objects that create microlensing effects. Microlensing occurs when a MACHO gets between us and a distant star, but instead ...
General relativity
... • A cluster of galaxies can also act as lens by deflecting light from galaxies behind it. • The mass of the galaxy cluster is obtained from faint arcs produced by a lens. ...
... • A cluster of galaxies can also act as lens by deflecting light from galaxies behind it. • The mass of the galaxy cluster is obtained from faint arcs produced by a lens. ...
concept map - kvszietmysorephysics
... (2C (i))SINGLE SLIT EXPERIMENT: Derivation of fraunhoffer diffraction at a single slit – positions of maxima and minima. Intensity distribution curve in diffraction pattern. Difference between interference and diffraction. Validity of ray optics – Fresnel distance. Resolving power of microscope and ...
... (2C (i))SINGLE SLIT EXPERIMENT: Derivation of fraunhoffer diffraction at a single slit – positions of maxima and minima. Intensity distribution curve in diffraction pattern. Difference between interference and diffraction. Validity of ray optics – Fresnel distance. Resolving power of microscope and ...
JellOlenses_Students
... Part 1: Snell’s Law Different materials/media bend light differently according to their respective indices of refraction (n). Snell’s Law relates the index if refraction of a medium to the resulting angle (θ2) of light for a given incident beam at angle θ1: n1 sin( 1 ) n2 sin( 2 ) Air has an in ...
... Part 1: Snell’s Law Different materials/media bend light differently according to their respective indices of refraction (n). Snell’s Law relates the index if refraction of a medium to the resulting angle (θ2) of light for a given incident beam at angle θ1: n1 sin( 1 ) n2 sin( 2 ) Air has an in ...
Refraction of Light
... objects as small as a strand of DNA. • The current metamaterial lens works with infrared light, but the researchers hope the technology will expand to other wavelengths in the future. ...
... objects as small as a strand of DNA. • The current metamaterial lens works with infrared light, but the researchers hope the technology will expand to other wavelengths in the future. ...
AAS08 - Caltech Optical Observatories
... Swift J1955+2614, one of the strangest transients of recent years [3-5]. This galactic transient was discovered in the galactic plane by the Swift Gamma-Ray-Burst detector satellite. Followup observations revealed an extremely complex (and still poorly understood) light curve, followed by rapid fadi ...
... Swift J1955+2614, one of the strangest transients of recent years [3-5]. This galactic transient was discovered in the galactic plane by the Swift Gamma-Ray-Burst detector satellite. Followup observations revealed an extremely complex (and still poorly understood) light curve, followed by rapid fadi ...
OGLE 2008–BLG–290: an accurate measurement of the limb
... Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening. Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs f ...
... Aims. In high-magnification events, the lens caustic may cross over the source disk, which allows determination of the angular size of the source and measurement of its limb darkening. Methods. When such extended-source effects appear close to maximum magnification, the resulting light curve differs f ...
Bruemmer-Dark Matter
... There are no purely observational facts about the heavenly bodies. Astronomical measurements are, without exception, measurements of phenomena occurring in a terrestrial observatory or station; it is by theory they are translated into knowledge of a universe outside. ...
... There are no purely observational facts about the heavenly bodies. Astronomical measurements are, without exception, measurements of phenomena occurring in a terrestrial observatory or station; it is by theory they are translated into knowledge of a universe outside. ...
GEOMETRIC OPTICS
... Ray diagrams and predictions about images. Light from an object like a light bulb is given off in all directions. When we use a lens or mirror, not all the light waves are of interest. ...
... Ray diagrams and predictions about images. Light from an object like a light bulb is given off in all directions. When we use a lens or mirror, not all the light waves are of interest. ...
Reflection and Refraction - Gonzaga Physics Department
... 4. Place the semicircular glass plate frosted face down on the polar graph paper so that the middle of the straight edge of the plate is at the center of the paper with the straight edge along the 90◦ − 90◦ line. Project a single ray into the middle of the straight edge of the plate (center of the p ...
... 4. Place the semicircular glass plate frosted face down on the polar graph paper so that the middle of the straight edge of the plate is at the center of the paper with the straight edge along the 90◦ − 90◦ line. Project a single ray into the middle of the straight edge of the plate (center of the p ...
Chapter 18 Test
... 1. Which lenses are thicker at the center than at the edges? a. Concave lens b. Achromatic lens c. Convex lens d. Objective lens 2. What is a system of two or more lenses, such as a convex lens with a concave lens, that have different indices of refraction? a. Chromatic aberration b. Spherical lens ...
... 1. Which lenses are thicker at the center than at the edges? a. Concave lens b. Achromatic lens c. Convex lens d. Objective lens 2. What is a system of two or more lenses, such as a convex lens with a concave lens, that have different indices of refraction? a. Chromatic aberration b. Spherical lens ...
Kepler Mission
... DiStefano arXiv: 1002.3009 predicts order 500 orbiting WDs, neutron stars, etc will be detected by Kepler, often relying on microlensing (Sahu & Gilliland, 2003, ApJ). ...
... DiStefano arXiv: 1002.3009 predicts order 500 orbiting WDs, neutron stars, etc will be detected by Kepler, often relying on microlensing (Sahu & Gilliland, 2003, ApJ). ...
Optical Refraction
... Angle of refraction measured to normal from refracted ray Passing from lower to higher density, light refracted towards normal; high to low, away from normal ...
... Angle of refraction measured to normal from refracted ray Passing from lower to higher density, light refracted towards normal; high to low, away from normal ...
L133 DIRECT DETECTION OF LARGE CLOSE
... Jupiter-sized close-in planet around the source star of a causticcrossing microlensing event could generate an order 1% deviation in the light curve. This deviation would be detectable with a 10 m–class telescope making measurements every few minutes over the course of a night. In some cases, the pl ...
... Jupiter-sized close-in planet around the source star of a causticcrossing microlensing event could generate an order 1% deviation in the light curve. This deviation would be detectable with a 10 m–class telescope making measurements every few minutes over the course of a night. In some cases, the pl ...
Discovering Poor Groups with Strong Lensing
... • We only see clumps if they contain stars and/or gas. • Maybe astrophysical processes suppress star formation in small objects, so most clumps are invisible. ...
... • We only see clumps if they contain stars and/or gas. • Maybe astrophysical processes suppress star formation in small objects, so most clumps are invisible. ...
B. “Seeing” Dark Matter on Earth: WIMP Collisions
... Some of the most convincing evidence for dark matter comes from a phenomenon known as gravitational lensing. This was first predicted by Einstein in his theory of relativity. The theory predicts that large masses in outer space, such as clusters of galaxies, bend light that travels near them. So, as ...
... Some of the most convincing evidence for dark matter comes from a phenomenon known as gravitational lensing. This was first predicted by Einstein in his theory of relativity. The theory predicts that large masses in outer space, such as clusters of galaxies, bend light that travels near them. So, as ...
Ray optics
... For reflection of light, we have the situation shown in Figure 1. The two plane mirrors in Figure 2 are at 90o to each other, and the incident light beam is in the plane of the screen By making a careful sketch of the reflection beam in Figure 2, decide which best describes its final outgoing path. ...
... For reflection of light, we have the situation shown in Figure 1. The two plane mirrors in Figure 2 are at 90o to each other, and the incident light beam is in the plane of the screen By making a careful sketch of the reflection beam in Figure 2, decide which best describes its final outgoing path. ...
review 08 - geometric optics
... What type of lens is used as a magnifying glass? Where is the object located? What are the properties of the image? ...
... What type of lens is used as a magnifying glass? Where is the object located? What are the properties of the image? ...
100x(white) (oil objective lens)
... -Widely used to view the unstained living specimen by increasing the contrast between the object and background ,and this happen according to special condensers -No need to stain the specimen -Specimen darker than background ...
... -Widely used to view the unstained living specimen by increasing the contrast between the object and background ,and this happen according to special condensers -No need to stain the specimen -Specimen darker than background ...
Thin Lenses Notes
... sin c 2 n1 - Total Internal Reflection: for angles at the critical angle and bigger, no light is transmitted into material 2; the light ray just skims along the interface between the two materials. Apparent depth: ...
... sin c 2 n1 - Total Internal Reflection: for angles at the critical angle and bigger, no light is transmitted into material 2; the light ray just skims along the interface between the two materials. Apparent depth: ...
Stellar Kinematics
... Since very low mass stars are common (red dwarfs), maybe very, very low mass brown dwarfs are even more common ...
... Since very low mass stars are common (red dwarfs), maybe very, very low mass brown dwarfs are even more common ...
Advantages and Disadvantages
... Catadioptrics since mirrors can be produced at less cost than lenses in medium to large apertures •Reasonably compact and portable up to focal lengths of 1000mm •Excellent for faint deep sky objects such as remote galaxies, nebulae and star clusters due to the generally fast focal ratios (f/4 to f/8 ...
... Catadioptrics since mirrors can be produced at less cost than lenses in medium to large apertures •Reasonably compact and portable up to focal lengths of 1000mm •Excellent for faint deep sky objects such as remote galaxies, nebulae and star clusters due to the generally fast focal ratios (f/4 to f/8 ...
Gravitational microlensing
![](https://commons.wikimedia.org/wiki/Special:FilePath/Gravitational.Microlensing.Light.Curve.OGLE-2005-BLG-006.png?width=300)
Gravitational microlensing is an astronomical phenomenon due to the gravitational lens effect. It can be used to detect objects that range from the mass of a planet to the mass of a star, regardless of the light they emit. Typically, astronomers can only detect bright objects that emit much light (stars) or large objects that block background light (clouds of gas and dust). These objects make up only a tiny portion of the mass of a galaxy. Microlensing allows the study of objects that emit little or no light.When a distant star or quasar gets sufficiently aligned with a massive compact foreground object, the bending of light due to its gravitational field, as discussed by Einstein in 1915, leads to two distorted unresolved images resulting in an observable magnification. The time-scale of the transient brightening depends on the mass of the foreground object as well as on the relative proper motion between the background 'source' and the foreground 'lens' object.Since microlensing observations do not rely on radiation received from the lens object, this effect therefore allows astronomers to study massive objects no matter how faint. It is thus an ideal technique to study the galactic population of such faint or dark objects as brown dwarfs, red dwarfs, planets, white dwarfs, neutron stars, black holes, andMassive Compact Halo Objects. Moreover, the microlensing effect is wavelength-independent, allowing study of source objects that emit any kind of electromagnetic radiation.Microlensing by an isolated object was first detected in 1989. Since then, microlensing has been used to constrain the nature of the dark matter, detect extrasolar planets, study limb darkening in distant stars, constrain the binary star population, and constrain the structure of the Milky Way's disk. Microlensing has also been proposed as a means to find dark objects like brown dwarfs and black holes, study starspots, measure stellar rotation, and probe quasars including their accretion disks.