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Question

Explain the following terms:

(a) plane mirror

(b) incident ray

(c) reflected ray,

(d) angle of incidence, and

(e) angle of reflection.

Draw diagram/diagrams to show them.

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Solution

(a) Plane mirror: A plane mirror is a highly polished and smooth reflecting surface made from a clear plane glass sheet, usually thin and silvered with suitable reflecting abrasive (for example, mercury) on one side. Its reflecting surface is plane.
selina-icse-solutions-class-9-physics-reflection-light-7a-3s
(b) Incident ray: The light ray striking a reflecting surface is called the incident ray.

(c) Reflected ray: The light ray obtained after reflection from the surface, in the same medium in which the incident ray is travelling, is called the reflected ray.

(d) Angle of incidence: The angle which the incident ray makes with the normal at the point of incidence is called the angle of incidence. It is denoted by the letter i.

(e) Angle of reflection: The angle which the reflected ray makes with the normal at the point of incidence is called the angle of reflection. It is denoted by the letter r.
selina-icse-solutions-class-9-physics-reflection-light-7a-3s-1


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