Find the thickness of a plate which will produce a change in optical path equal to half the wavelength λ of the light passing through it normally. The refractive index of the plate is μ .

Question

Philoid · Accepted Answer

The optical path length () of a light passing through a plate is .

Given,

Therefore, the light has to pass through a distance of to produce a change in optical path length of .

Find the thickness of a plate which will produce a change in optical path equal to half the wavelength λ of the light passing through it normally. The refractive index of the plate is μ.