Question

A beam of a light incident on a glass prism gets splitting into seven colors as VIBGYOR a) which colour has longer wave length?
b) write the relation between refractive index and wave length in the above activity

Answer 1

a)red color has the longest wavelength

b)

$n \: = \frac{c}{v} \\ we \: know \: that \\ v = f \times wavelength \\ n = \frac{c}{f \times wavelength}$

hence refractive index and wavelength are inversely proportional

I hope this helps ( ╹▽╹ )