Ray Optics and ...

The radius of curvature of a plane mirror is:

The twinkling of stars is due to atmospheric

A mirage occurs because

A ray of light is incident on a hollow glass prism as shown. Then the ray will undergo :

An under-water swimmer cannot see very clearly even in absolutely clear water because of:

Which one of the following statements is correct?

Light enters an isosceles right triangular prism at normal incidence through face AB and undergoes total internal reflection at face BC as shown below :
The minimum value of the refractive index of the prifsm is close to:

The term refraction of light is best described by:

The distance between the extreme points on the periphery of the mirror is called :

A coin is placed at the bottom of a glass tumbler and then water is added. It appeared that the depth of the coin has been reduced because