Question

5.
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.​

Answer 1

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➞ It is showed that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane by an activity using mirror and pins.

Explanation:

• ↦The law of reflection state that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane. This is explained by a simple example of mirror activity:

• ↦Take a paper, and stick it to a plane table or plane surface. Draw a horizontal line and consider that line as a plane. Draw an incident ray to intersect plane and incident ray.

• ↦Place a mirror in the line of plane. Make sure that mirror is perpendicular to the line.

• ↦Fix minimum 2 numbers of pins on the incident ray. Look for the mirror image of those two pin fixed before. Now, Fix other pin in such a way that pin in the mirror will make straight line with the inserted one. And draw straight line joining later pins. Remove the mirror, and drawway that pin in the mirror will make straight line with the inserted one. And draw straight line joining later pins. Remove the mirror, and draw normal to the line of plane at point of contact of incident ray. In the figure created, incident ray, normal and reflected ray are created on single paper. So this proves that incident, normal and reflected ray lie on the same plane.