Question

For what angle of incidence, the lateral displacement is maximum? Can it be zero?

Answer 1

The lateral displacement in a glass slab is maximum when the angle of incidence is 90°. At this angle, the displacement equals the thickness of the slab. This is derived from the formula x = `t sin(i - r)/cos r`, where (i) is the angle of incidence and (r) is the angle of refraction. The lateral displacement is zero when the angle of incidence is 0°, meaning the light passes straight through without any lateral shift.