Describe an activity to show that the incident ray, the reflected ray, and the normal at the point of incidence lie in the same plane.
Aim
To show that the incident ray, the reflected ray, and the normal at the point of incidence lie in the same plane.
Materials required
A drawing board, a white sheet of paper, a few common pins, and a plane mirror.
Procedure
Observation
It will be seen that the angles which the lines make on both sides of the normal will be equal (refer to the attached image). So, if one line represents the incident ray, the other line represents the reflected ray.
Conclusion
Since the lines representing the normal and the incident and reflected rays are all represented on the sheet of plain paper, hence the incident ray, the reflected ray, and the normal all lie on the same plane.