Relation between refractive index and critical angle
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In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how fast light travels through the material. It is defined as
where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times as fast in vacuum as in water.
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if the critical angel is exceed all of the light is reflected . this is known as internal refraction.on the other hand the index of refractive determine how much the wave bend in certain medium.
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