Question

The figure given below shows an incident ray AO and the normal ON on a plane mirror. The angle which the incident ray AO makes with the mirror is 30°.

(a) Find the angle of incidence.
(b) Draw the reflected ray and then find the angle between the incident and reflected rays.

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Answer

(a) The angle of incidence = 90° – 30° = 60°

(b) Diagram showing the reflected ray is given below:

reflected-ray-normal-plane-mirror-concise-physics-solutions-icse-class-9-1200x756

The angle between the incident ray and the reflected ray = angle of incidence + angle of reflection

As we know,

Angle of incidence = Angle of reflection = 60°

Therefore, we get,

60° + 60° = 120°

Hence, the angle between the incident ray and reflected ray = 120°

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