Discuss refraction through a glass slab and show that emergent ray is parallel to incident ray but displaced?

Give the laws of refraction. Show that emergent ray from a glass slab is parallel to incident ray.

A ray of light passes through four transparent media with refractive indices mu_(1),mu_(2),mu_(3), and mu_(4) as shown in figure. The surfaces of all media are paralle. If the emerent ray CD is parallel to the incident ray AB, we must have

Discuss the refraction of light through a compound slab and show that "^amu_g = ^amu_w xx ^wmu_g

Draw a ray diagram to show the refraction of light through a glass prism. Hence obtain the relation for the angle of deviation in terms of the angle of incidence, angle of emergence and the angle of the prism.

When a ray of light passes through a parallel slab of transport medium, then show that angle of incidence is equal to angle of emergence.

What is the angle of incidence of a ray if the reflected ray is at an angle of 90^@ to the incident ray ?