A ray of light ab passing through air enters a liquid of refractive index µ1 at the boundary XY. In the liquid, the ray is shown as bc. The angle between ab and bc (angle of deviation) is δ. The ray then passes through a rectangular slab ABCD of refractive index µ2 (µ2 > µ1) and emerges from the slab as ray de. The angle between XY and AB is θ. The angle between ab and de is
1
δ
2
δ + θ
3
\(\delta+\sin ^{-1}\left(\frac{\mu_1}{\mu_2}\right)\)
4
\(\delta+\theta-\sin ^{-1}\left(\frac{\mu_1}{\mu_2}\right)\)