The refractive index of glass is 1.5. From a point P inside a glass slab, draw three rays PA, PB and PC incident on the glass-air surface making angles of incidence 30∘, 42∘ and 60∘ respectively.(a) In the diagram show the approximate direction of these rays as they emerge out of the slab.(b) What is the angle of refraction for the ray PB.Hint: sin(42∘)=2/3

The refractive index of glass is 1.5. From a point P inside a glass sl

1.	The refractive index of glass is 1.5. From a point P inside a glass slab, draw three rays PA, PB and PC incident on the glass-air surface making angles of incidence 30∘, 42∘ and 60∘ respectively.(a) In the diagram show the approximate direction of these rays as they emerge out of the slab.(b) What is the angle of refraction for the ray PB.Hint: sin(42∘)=2/3
Answer» The refractive index of glass is $1.5$ . From a point P inside a glass slab, draw three rays PA, PB and PC incident on the glass-air surface making angles of incidence $30^{\circ}$ , $42^{\circ}$ and $60^{\circ}$ respectively. (a) In the diagram show the approximate direction of these rays as they emerge out of the slab. (b) What is the angle of refraction for the ray PB. Hint: $sin (42^{\circ}) = 2 / 3$