Question

state the law of reflection describe an activity to show that incident ray reflected ray and the normal at the point of incidence all lies in the same plane

Answer 1

The law of reflection are -
1. angle of incident is equal to angle of reflection.
2. incident ray, reflected ray and normal all lies on the same plane

The above activity will show that the incident ray, reflected ray and the normal at the point of incidence all the three lie in the same plane.



1. Take a white sheet, spread it on a table.

2. Draw a line MM' on it and place a plane mirror vertically on this line.

3. Take a comb and cover all the opening of it except one. Now, let light pass through this opening such that the parallel light rays fall on the mirror.

4. Adjust the set-up in such a way that a pattern of incident and reflected ray is formed.

5. Now mark points A, B, C on incident ray and points D, E, F on its corresponding reflected ray.

6. Remove the mirror and join the points. Extend the line ABC and DEF to meet MM' at O.

7. OA is incident ray and OF is reflected ray. Draw ON perpendicular to MM'.

Therefore, we can see that incident ray, reflected ray and normal at the point of incidence, all lie in one plane.

Answer 2

The law of reflection are- (1) first angle of incident is equal to angle of reflection (2) incident ray reflected ray and normal all lies on the same plane