Question

(i) state the basic laws which determines the reflection of light by plane mirrors.

Answer 1

1) the angle of incidence is equal to the angle of reflection.
2) the incident ray, the reflected ray and the normal at the point of incidence, lie in the same plane.

Answer 2

THE TWO LAWS OF REFLECTION OF LIGHT ARE :-

1. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane.
2. The angles of incidence is equal to the angle of reflection.

The laws of reflection are applicable to all the surfaces, whether polished or rough.

Some Terms Related To The Laws Of Reflection Are:-

• A ray of light which strikes the reflecting surface is called the incident ray.
• The ray of light which returns back into the same medium after reflection from the reflecting surface is called the reflected ray.
• The point on the reflecting surface at which the incident ray strikes is called the point of incidence.
• The line drawn perpendicular to the reflecting surface at the point of incidence is called the normal.
• The angle formed between the normal and the incident ray at the point of incidence is called the angle of incidence.
• The angle formed between normal and the reflected ray at the point of incidence is called the angle of reflection.

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