Question

A ray of light falls on three glass slabs of the same material at the same angle of incidence. In which case, is the lateral displacement of the emergent ray of light
(a) maximum
(b) minimum

Answer 1

Concept : There is a direct formula for this kind of questions which is lateral displacement
$x=\left(\frac{t}{\cos r}\right)\sin (i-r)$
Here, t is thickness of slab
i is angle of incidence
r is angle of refraction.
Solution: Since, $x\alpha t$
Hence the slab having more thickness will have maximum lateral displacement and vice versa.
So, slab 3 will have maximum lateral displacement whereas slab 1 will have minimum lateral displacement.