The angle between the normal and refracted ray is called:

1. angle of deviation
2. angle of incidence
3. angle of refraction
4. angle of emergence

The property of splitting of white light into its seven constituent colours is known as:

1. rectilinear propagation
2. refraction
3. reflection
4. dispersion

A ray of light passing through the centre of curvature of a spherical mirror, after reflection:

1. passes through the focus
2. passes through the pole
3. becomes parallel to the principal axis
4. retraces its own path

If the radius of curvature of a concave mirror is 20 cm, its focal length is:

1. 10 cm
2. 20 cm
3. 40 cm
4. 80 cm