Question

If a ray of light falls along the normal of a plane mirror, then the light ray will reflect back at angle of

Answer 1

Reflection of light

1. According to the laws of reflection, the angle between the incident ray and the normal to the surface at the point of incidence is equal to the angle between the reflected ray and the normal of the same.
2. Thus, if the incident ray is along the normal, the angle between the incident ray and the normal will be $0°$.
3. Consequently, the angle between the reflected ray and the normal will also be $0°$.
4. This means that the ray of incidence, the normal, and the ray of reflection are all on the same line.

Therefore, the angle at which the ray will reflect back will be $0°$.