Lateral Shift — Glass SlabMediumQuestion 20222
Question
Lateral displacement of a ray passing through a glass slab of thickness t at angle of incidence i is:
- At cosθ_r/(cos(i−r))
- Bt sin(i−r)/cos rCorrect
- Ct(n−1)/n
- Dt sinθ_r
Correct answer
t sin(i−r)/cos r
Explanation
Lateral shift d = t × sin(i − r)/cos r, where r is the angle of refraction. The emergent ray is parallel to the incident ray but displaced laterally.