Question

Describe an activity to show that the incident ray, the reflected ray and the normal at the point of the incidence lie in the same plane.

Answer 1

Hint In this question, the concept of the incident ray, the reflected ray and the normal will be used as the incident ray is ray of light from a source that falls on the surface is called incident ray. The reflected ray is the point on the surface where incident ray strikes is called reflected ray,

Complete step by step answer
 We have to consider the figure (1) to show the incident ray, reflected ray and the normal at the point of incidence that lie in the same plane,
Let we place the plane mirror on the table and take a sheet of paper. In the center of the sheet, make a small hole.
Ensure that the light in the room is not bright and keep the sheet normal to the table.
Now, take another sheet of the paper and place the sheet in contact with the vertical mirror. Draw a line on the paper from the mirror. Then use a torch to put the focus of the torch on the mirror through the small hole. So, that ray of light falls on the line, which is normal to the bottom of the mirror.
When the ray of light passes through the hole and that is incident on the mirror, so the ray gets reflected in a certain direction.
So, we can easily observe that the incident ray and the reflected ray and the normal to the mirror at the point of incidence on the sheet of paper placed on the table.

                                                            Figure (1)

Therefore, this above observation shows that the incident ray and the reflected ray and the normal all lie in the same plane at the point of incidence.

Note
As we know that the angle of incidence is equal to the angle of reflection, \[\angle i = \angle r\], and the reflected ray and incident ray and the normal at the point of incidence all these lie on the same plane.