Question

we know that refractive index is inversely proportional to wavelength (n =c/v = f x wavelenth in vaccum / f × wavelength in medium , therefore n ∝ 1/wavelength) . but how colour depends on refractive index? please tell me. please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please please​

Answer 1

Answer:

colour is a visual representation of different frequencies of light present in the visible spectrum, like we see light of wavelength 450nm as blue light. since wavelength is inversely proportional to refractive index, we can use the refractive index of an object to calculate the wavelength of light and thus can get the idea of the colour of light.

Answer 2

Answer:

n ∝ 1/wavelength.

Wavelength range of visible rays represent colours.

400nm wavelength represents purple light whereas 700nm wavelength represents red light.

This means wavelength ranging from 400 to 700 nm also represents colour.

You can use the same relation, n ∝ 1/wavelength as colour directly depends on wavelength of light.