A single ray traverses a glass plate (thickness = t) with plane surfaces that are parallel to each other. The emergent ray is parallel to the incident ray but suffers a lateral displacement d. Assuming that glass plate (refractive index `mu`) is placed in air, find the dependence of d on angle of incidence i. Plot the variation of d with i (changing from `0°` to `90°`)

Answer

`d = t sin i[1-(cosi)/(sqrt(mu^(2)-sin^(2)i))]`