Physics

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}

29^{\circ}

40^{\circ}

25^{\circ}