Question

The incident ray, the reflected ray and the normal at the point of incidence _________.

• A. lie in planes that are mutually perpendicular to each other
• B. lie in planes that are parallel to each other
• C. lie in the same plane
• D. lie in the different planes

Answer 1

The correct option is (D) lie in the same plane

1. According to the first law of the reflection the incident ray, the reflected ray, and the normal at the point of incidence, lie in the same plane.
2. The normal is perpendicular to the plane of reflection and the angle of incidence $\angle i$ is equal to the angle of reflection $\angle r$.