Question

When length of wavelength lambda travels through a glass the refractive index of glass varies with wavelength as u=a+b/lambda ^2 what are the dimensional formula of a and b?

Answer 1

Answer:

a= unitless b=L^2

Explanation:

Refractive index is a unitless quantity. So a should be unitless. In order to add a in eqn

b/lambda^2 should be unitless. When b has dimesion L^2 the term will be unitless.