A light ray in air strikes a plane glass slab ( ) at an angle of to the normal

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A light ray in air strikes a plane glass slab (

n=1.5

) at an angle of

40^{\circ}

to the normal. After refraction through the slab, it emerges into water (

n=1.33

) through the parallel back surface. What is the angle the emergent ray makes with the normal in water? (a)

47^{\circ}

(b)

29^{\circ}

(c)

40^{\circ}

(d)

25^{\circ}