Question

A rainbow is the combined effect of the refraction,dispersion,and total internal reflection of light Prove that

Answer 1

1. The variation in refractive index with colour is called as dispersion.
2. A rainbow is an example of dispersion
3. Refractive index is the measure of degree of
refraction and is calculated as
ratio sin i upon sin r.
( Absolute refractive index is nothing but refractive index of given medium with respect to vaccume.)

Answer 2

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