Question

In case of refraction of light through a glass slab , refraction of light occurs twice.One when it enters the glass slab from air and the other one when it enters the air from the glass slab. Refraction is due to change in speed of light as it enters from one transparent medium to another and it follows certain laws of refraction.The extent of the change in direction that takes place in a given pair of media may be expressed in terms of the refractive index.
Q1 When light passes from glass to air,the speed of light:
Q2 the speed of light in material A is 1.25 times its speed in material B,then the ratio of the refractive indices of these materials is:
Q3.A ray of light is incident normally to the surface of a glass slab placed in air.The angle of incidence in this case is: *​

Answer 1

Answer:

1)speed of light increases

2)1.25:1

3)0°