DEFINE REFRACTIVE INDEX....
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Refractive index
Explanation:
In optics, the refractive index 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
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Explanation:
refractive index
=>the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
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