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Total internal reflection critical angle:examples & applications

What is total internal reflection and when does it occurs ? When a ray of light travelling in denser medium enters into a rarer medium, it bends away from the normal. If the angle of incidence ‘i’ increases’ the angle of refraction ‘r’ also increases. For a particular value of the angle of incidence, the angle of refraction becomes 90°. ...

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Total internal reflection:conditions,uses and examples

Total Internal Reflection One of the qualities of any optically transparent material is the speed at which light travels within the material, i.e., it depends upon the refractive index n of the material. The index of refraction is merely the ratio of the speed of light c in vacuum to the speed of light v in that material.Expressed mathematically: n=c ...

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Diffraction grating:Formula,theory,experiment & applications

Diffraction grating definition “The diffraction grating is a useful device for analyzing light sources.It consists of a large number of equally spaced parallel slits.”Its working principle is based on the phenomenon of diffraction.The space between lines act as slits and these slits diffract the light waves thereby  producing a large number of beams which interfere in such a way to ...

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difference between fresnel and frounhofer diffraction

what is Fresnel’s diffraction? Fresnel diffraction can be observed if the source of light and the screen at which diffraction pattern is formed are kept at finite distance from the diffracting obstacle.In this situation the wave fronts falling on the obstacle are not plane.Similarly the wave fronts leaving the obstacle are not plane. what is Fraunhofer diffraction? Fraunhofer diffraction can ...

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difference between microscope and telescope

Difference table between microscope and telescope:     Microscope      Telescope                                                                                                 ...

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Difference between interference and diffraction of light

Interference of light The modification in the distribution of light energy due to superposition of two or more waves is called interference of light. Conditions for interference Light source should be monochromatic. Light source should be coherent mean they should not be independent but should be subsidiary source and derived from a single source. The light source should be narrow ...

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newton’s rings experiment with animation

Newton’s Ring: Newton’s rings is a process in which Circular bright and dark fringes obtained due to air film enclosed between a Plano convex lens and a glass plate. An air wedge film can be formed by placing a plano-convex lens on a flat glass plate.The thickness of film is zero where the lens and the plate are in contact ...

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Difference between constructive and destructive intereference

 What is interference? Interference of light is defined as:”When two or more light waves having same frequency,same wavelength and same amplitude meet together in a medium at a point,they cancel or enhance the effect of each other at that point.This phenomenon is called interference of light waves.” Types of interference: There are two types of interference of light. Constructive interference ...

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Diffraction of light types, examples and 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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Different types of optical fibres with uses

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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