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Question

What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram : (a) Incident ray (b) Reflected ray (c) Point of incidence (d) Normal (e) Angle of incidence (f) Angle of reflection


Solution

Bouncing back of a light ray after hitting any surface is known as reflection.

Definitions:

a) Incident ray:  The ray of light which falls on the surface is called incident ray.

b) Reflected ray:  The ray of light which is sent back by the reflecting surface is called reflected ray.

c) Point of incidence: The point where the incident ray strikes the surface is known as point of incidence.

d) Normal: The perpendicular line drawn onto the surface at the point of incidence is called normal.

e) Angle of incidence: The angle made by the incident ray with the normal at the point of incidence is called angle of incidence.

f) Angle of reflection: The angle made by the reflected ray with the normal at the point of incidence is called angle of reflection.

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