A ray in air is incident at 30° on a plane-parallel glass slab of thickness 9 cm and refractive index 1.400. Calculate the lateral displacement of the emergent ray.
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A ray in air is incident at 30° on a plane-parallel glass slab of thickness 9 cm and refractive index 1.400. Calculate the lateral displacement of the emergent ray.

G1 Physics · Accepted Answer

Snell's law gives sin r = sin 30°/1.400, so r = 20.92°. Lateral shift d = t sin(i−r)/cos r = 1.52 cm.