According to the law of reflection:

1. $\dfrac{i}{r}$ = Constant

2. $\dfrac{\text {sin i}}{\text {sin r}}$ = Constant

3. i + r = Constant

4. i = r

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

1. 90°
2. 45°
3. 30°
4. 0°

The perpendicular drawn on the surface at the point of incidence is called :

1. normal
2. incident ray
3. reflected ray
4. none of the above

The image formed due to the actual intersection of the reflected rays is :

1. virtual
2. diminished
3. real
4. enlarged