Question

a light ray falls at an angle of 25° on a opaque object​

Answer 1

Answer:

If a ray of light is incident normal to the surface of the plane mirror, then the angle of incidence is 00, as the normal passes perpendicularly to the mirror. Case (b): ... So, the reflected ray will retrace the path of the incident ray.

Explanation:

The Second Law of Reflection states that the angle of incidence is always equal to the angle of reflection. Therefore, the angle of reflection is same as the angle of incidence, that is, 00. So, the reflected ray will retrace the path of  the incident ray.