Chapter - 6 Light

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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.


Activity: Take a plane mirror and place it on a plain sheet of paper in a standing position with a block. Take one more piece of paper and make a small hole in a paper and hold it perpendicular to the plane of the table. Draw a line perpendicular to the mirror on the piece of paper which is on the table. Now beam light rays with the help of a torch through the small hole such that the beam of light hits the normal at the bottom of the mirror. The light rays from the hole are incident on the mirror and a ray of light will be reflected. Then draw an incidence line on this paper.  You will observe that incident ray. reflected ray and normal will be in the same plane, i.e. on the sheet of paper. This verifies the law of reflection.

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