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Diffraction grating experiment

What is diffraction? “The bending of light waves around the corners of an opening or obstacle and spreading of light waves into geometrical shadow is called diffraction.”Diffraction effect depends upon the size of obstacle.Diffraction of light takes place if the size of obstacle is comparable to the wavelength of light.Light waves are very small in wavelength,i.e,from 4×10-7 m to 7 × 10 -7 m.If ...

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Fiber optic communication

Introduced to Fibre Optics: For hundreds of years man has communicated using flashes of reflected Sunlight by day and lanterns by night.Navy signalmen still use powerful blinker lights to transmit coded massages to other ships during periods of radio-silence. Light communication has not been confined to simple dots and dashes. It is an interesting but little known fact that Alexander ...

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Difference between Concave mirror and convex Mirror

What are Spherical Mirrors? A mirrors whose polished, reflecting surface is a part of a hollow sphere of glass or plastic is called a spherical mirror. In a spherical mirror, one of the two curved surface is coated with a thin layer of silver followed by a coating of red lead oxide paint. Thus, one side of the spherical mirror ...

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Refraction of light

What is Refraction of Light? Refraction of light is defined as:”The process of bending of light as it passes from air into glass and vice versa is called refraction of light.” If we dip one end of a pencil or some other object into water at an angle to the surface, the submerged part looks bent. Its image is displaced ...

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Difference between convex and concave lens

What are Lenses? “Lens is a piece of transparent material of which one or both sides are  spherical.”It is any transparent material having two surfaces, of which at least one is curved. Lenses refract light in such a way that an image of the object is formed.Each surface of a lens is a part of a sphere.The centre of that ...

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Reflection and refraction of light examples

What is Reflection? Reflection is defined as:”When light traveling in a certain medium falls on the surface of another medium,a part of it turns back in the same medium.”We see a page of a book because light reflects from each part of the page in all directions,so that some of the light rays from each part of the page enter ...

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what is Light in physics

What is light?  Light is a form of energy which is given by luminous objects.The Sun,bulb,candle,etc.are luminous objects.Other objects which do not give out light are called non luminous objects.Light can pass through transparent materials.Glass,water,clear plastic and air are transparent materials.Light can not pass through translucent materials.A tracing paper,frosted glass and waxed paper are translucent materials. Light behaves differently when ...

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Black body radiation

When a body is heated,it emits radiation.The nature of the radiation depends upon the temperature.At low temperature,a body emits radiation which is principally of long wavelengths in the invisible infrared region.At high temperature ,the proportion of shorter wavelength radiation increases. Furthermore,the amount of emitted radiation is different for different wavelengths.It is of interest to see how the energy is distributed ...

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How do lasers work

What is “LASER”? The name “LASER” stands for light Amplification by Stimulated Emission of Radiation.The lasers are used to produce light having following properties: Monochromatic Directionality Brightness Coherence Polarization One of the most important property of laser light is its monochromaticity. The word monochromatic comes from Greek word monos means single and chroma means colour. actually all lasers have very ...

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The Photoelectric Effect experiment with animation

What is photoelectric effect? “When light of suitable frequency falls on a metal surface, electrons are emitted from the metal surface.This phenomenon is called photoelectric effect.” The electron emitted in this process are known as photoelectric. Explanation: Experimental Setup: The apparatus used to observe the photoelectric effect is shown in above Figure: It consists of an evacuated glass tube in ...

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