Photo = Illusion
... Motivation • What is the difference between a hologram and a lenticular screen? ...
... Motivation • What is the difference between a hologram and a lenticular screen? ...
human eye and colourful world part 2
... space, the sky will appear to be dark. The least scattering red colour light finds its application in various fields. For example, in marking red light, danger signals etc. red colour is preferred because it is scattered least by fog, smoke, and dust particles present in air. 2. Sunrise and sunset A ...
... space, the sky will appear to be dark. The least scattering red colour light finds its application in various fields. For example, in marking red light, danger signals etc. red colour is preferred because it is scattered least by fog, smoke, and dust particles present in air. 2. Sunrise and sunset A ...
dec 2016_nature of light unit test review sheet answer key
... 2. What is the relationship between the size of a shadow on a screen and the distance of the screen from the object that produces the shadow? - When an object is closer to a screen, the shadow size decreases. - When an object is further away from a screen, the shadow size increases. 3. What is the r ...
... 2. What is the relationship between the size of a shadow on a screen and the distance of the screen from the object that produces the shadow? - When an object is closer to a screen, the shadow size decreases. - When an object is further away from a screen, the shadow size increases. 3. What is the r ...
Light and Optics Unit Test
... 36. Rachele shines a light through a prism and sees a variety of colors shown up against the wall. The color she sees in the middle of the spectrum is: a. red b. yellow c. green d. indigo 37. The ciliary muscles are located around the lens of the eye. These muscles help the eye to: a. produce tears ...
... 36. Rachele shines a light through a prism and sees a variety of colors shown up against the wall. The color she sees in the middle of the spectrum is: a. red b. yellow c. green d. indigo 37. The ciliary muscles are located around the lens of the eye. These muscles help the eye to: a. produce tears ...
Electromagnetic Waves - University of Toronto Physics
... Light will not pass through a polarizing filter if its polarization axis is A. Parallel to the filter polarization B. Perpendicular to the filter polarization C. 45 degrees to the filter polarization ...
... Light will not pass through a polarizing filter if its polarization axis is A. Parallel to the filter polarization B. Perpendicular to the filter polarization C. 45 degrees to the filter polarization ...
L 32 Light and Optics-4 Light “rays” travel in straight lines Wave or
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
L32.ppt
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
L 32.ppt
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
Why is the sky purple? - Little Shop of Physics
... times that at midday, so light passes through 12 times more atmosphere at sunrise and sunset. When we greet the day or say goodnight, we see beautiful sights in the yellow, orange, and red part of the spectrum, for the shorter wavelengths have been scattered away. The experiment goes like this: • Pl ...
... times that at midday, so light passes through 12 times more atmosphere at sunrise and sunset. When we greet the day or say goodnight, we see beautiful sights in the yellow, orange, and red part of the spectrum, for the shorter wavelengths have been scattered away. The experiment goes like this: • Pl ...
Chapter 20-Light The Nature of Light Visible Light Is a Form of
... e. Lenses are used in many kinds of instruments i. Camera=parts of a camera are lightproof box, opening in front of the camera, shutter over the opening, convex lens behind the opening, film at the back of the camera, device to hold and turn the film ii. Light microscope= two convex lenses one at ea ...
... e. Lenses are used in many kinds of instruments i. Camera=parts of a camera are lightproof box, opening in front of the camera, shutter over the opening, convex lens behind the opening, film at the back of the camera, device to hold and turn the film ii. Light microscope= two convex lenses one at ea ...
L32
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
... • Thus far we have been dealing only with geometrical optics • In geometrical optics we deal only with the behavior of light rays it either travels in a straight line or is reflected by a mirror, or bent (refracted) when it travels from one medium into another. • However, light is a WAVE, and ther ...
Introduction to light 2
... Therefore the index of refraction is higher for short wavelengths and lower for long wavelengths of light ...
... Therefore the index of refraction is higher for short wavelengths and lower for long wavelengths of light ...
Optics - Mr. Gallagher's Physics
... • The reflected ray is the light ray that bounces off the mirror • Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. • The angle between the incident ray and the normal line is called the angle of incidence ...
... • The reflected ray is the light ray that bounces off the mirror • Between the incident and reflected rays, there is an imaginary line called the normal line which is perpendicular to the surface of the mirror. • The angle between the incident ray and the normal line is called the angle of incidence ...
concave lens
... Objects moving toward or away from a stationary observer have their wavelengths “shifted” to a shorter or longer value. In sound we call this the Doppler Effect. ( another one! ) To study the Doppler effect for light, the problem can be simplified by considering axial relative speeds that are much l ...
... Objects moving toward or away from a stationary observer have their wavelengths “shifted” to a shorter or longer value. In sound we call this the Doppler Effect. ( another one! ) To study the Doppler effect for light, the problem can be simplified by considering axial relative speeds that are much l ...
Invisibility Cup - Purdue Engineering
... very latest designs of metamaterials. Schurig et al.7 make their metamaterial by etching millimetre-sized cells out of a copper circuit board, in which the cells serve as the artificial atoms. The copper structures act as electromagnetic resonators that are tuned by slightly changing their shapes. T ...
... very latest designs of metamaterials. Schurig et al.7 make their metamaterial by etching millimetre-sized cells out of a copper circuit board, in which the cells serve as the artificial atoms. The copper structures act as electromagnetic resonators that are tuned by slightly changing their shapes. T ...
Speed of light
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 7008299792458000000♠299792458 metres per second (≈7008300000000000000♠3.00×108 m/s), as the length of the metre is defined from this constant and the international standard for time. According to special relativity, c is the maximum speed at which all matter and information in the universe can travel. It is the speed at which all massless particles and changes of the associated fields (including electromagnetic radiation such as light and gravitational waves) travel in vacuum. Such particles and waves travel at c regardless of the motion of the source or the inertial reference frame of the observer. In the theory of relativity, c interrelates space and time, and also appears in the famous equation of mass–energy equivalence E = mc2.The speed at which light propagates through transparent materials, such as glass or air, is less than c; similarly, the speed of radio waves in wire cables is slower than c. The ratio between c and the speed v at which light travels in a material is called the refractive index n of the material (n = c / v). For example, for visible light the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 7008200000000000000♠200000 km/s; the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 7008299700000000000♠299700 km/s (about 7004900000000000000♠90 km/s slower than c).For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and very sensitive measurements, their finite speed has noticeable effects. In communicating with distant space probes, it can take minutes to hours for a message to get from Earth to the spacecraft, or vice versa. The light seen from stars left them many years ago, allowing the study of the history of the universe by looking at distant objects. The finite speed of light also limits the theoretical maximum speed of computers, since information must be sent within the computer from chip to chip. The speed of light can be used with time of flight measurements to measure large distances to high precision.Ole Rømer first demonstrated in 1676 that light travels at a finite speed (as opposed to instantaneously) by studying the apparent motion of Jupiter's moon Io. In 1865, James Clerk Maxwell proposed that light was an electromagnetic wave, and therefore travelled at the speed c appearing in his theory of electromagnetism. In 1905, Albert Einstein postulated that the speed of light with respect to any inertial frame is independent of the motion of the light source, and explored the consequences of that postulate by deriving the special theory of relativity and showing that the parameter c had relevance outside of the context of light and electromagnetism. After centuries of increasingly precise measurements, in 1975 the speed of light was known to be 7008299792458000000♠299792458 m/s with a measurement uncertainty of 4 parts per billion. In 1983, the metre was redefined in the International System of Units (SI) as the distance travelled by light in vacuum in 1/7008299792458000000♠299792458 of a second. As a result, the numerical value of c in metres per second is now fixed exactly by the definition of the metre.