The plane containing the incident ray and normal is called :

1. plane of reflection
2. normal plane
3. plane of incidence
4. none of the above

Regular reflection occurs when a beam of light falls on a ……………

1. smooth surface
2. polished surface
3. rough surface
4. Both (a) and (b)

For a ray incident normally on a plane mirror, the angle of incidence is :

1. 90°
2. 45°
3. 30°
4. 0°

For a ray incident normally on a plane mirror, the angle of reflection is :

1. 90°
2. 0°
3. 45°
4. 30°