Need asap
when light is reflected by a mirror, the angle of incidence is always
a. less than the angle of reflection.
b. greater than the angle of reflection.
c. equal to the angle of reflection.
d. 90 degrees with respect to the reflecting surface.

Equal to the angle of reflection.

Explanation:

There are two laws given for the reflection through mirrors. According to the law of reflection :

1. The angle of incidence, the angle of reflection, the incident ray, the reflected ray and the point of incidence all lie in the same plane.

2. The angle of incidence is equal to the angle of reflection.

So, when light is reflected by a mirror, the angle of incidence is always equal to the angle of reflection. Hence, the correct option is (c).

are their multiple choices ?

explanation:

we need to know the time interval during which the force acts. impulse of force = momentum change