The refractive index of glass is 1*5 from a point P inside a glass slab, draw rays PQ, PB and PC incident on the glass-air surface at an angle 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 (Take sin42^(@)=(2)/(3))

The refractive index of glass is 1*5 from a point P inside a glass sla

1.	The refractive index of glass is 1*5 from a point P inside a glass slab, draw rays PQ, PB and PC incident on the glass-air surface at an angle 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 (Take sin42^(@)=(2)/(3))
Answer» ANSWER :(B) `90^(@)`.