The condition required for total internal reflection to take place is:

1. light ray passes from a rarer to denser medium
2. light ray passes from a denser to rarer medium
3. angle of incidence is less than critical angle
4. none of the above

A total reflecting prism is:

1. right-angled prism
2. equilateral prism
3. right-angled isosceles prism
4. all of the above

Which of the following figures will depict deviation of ray of light A through 180°

In the figure given below, the ray PQ emerging from the object P is refracted along QS. The angle PQN is known as:

1. angle of deviation
2. angle of refraction
3. critical angle
4. none of the above