Name: Care of Eyes
Uploaded: 2019-07-19
Duration: 4 min 20 s
Description: Eyes are indeed the best gift from God. We are not aware of its importance as long as our vision is perfect. In this video, let’s learn about how to take car...

Question

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.

Accepted Answer

To show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane:

(i) Fix a white sheet of paper on a table.

(ii) Take a comb and cover all its openings except one.

(iii) Keep the comb perpendicular to the paper and throw light through the opening of the comb on one side so that the path of light can be observed on the paper on the other side of the comb.

(iv) A piece of plane mirror is placed on the path of the light.

(v) The light ray that is incident on the plane mirror is the incident ray and the ray that is reflected from the plane mirror are in a different direction.

(vi) When the paper lies on the top of the table, the rays lie on the same plane.

(vii) Let the sheet of the paper extend a bit beyond the edge of the table.

(viii) Make sure the reflected ray extends to the projected portion of the paper.

(ix) Cut the projected portion of the paper in the middle and bend it.

The reflected ray won’t be seen in the bent paper because it creates a different plane from the plane in which the incident ray, the reflected ray, and the normal lie. Thus, it can be concluded that the incident ray, the reflected ray, and the normal at the point of incidence lie in the same plane.

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.

Important Questions on Light

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