Question

what is meant by refractive index explain with diagram

Answer 1

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$\mathfrak{\green{Answer.}}$Refractive index, also called index ofrefraction, measure of the bending of a ray of light when passing from one medium into another. ... Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.
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Answer 2

refractive index is denoted by n you can see science 1 text book of the 10 std