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Question

(a) Find the angle of incidence.
(b) Find the angle between the incident and reflected rays.
Figure shows an incident ray AO and the normal ON on a plane mirror. The angle which the incident ray AO makes with a mirror is 30.

202301_8bcc43f134b64f32a7bf13ba9284d6e8.png

A
(a)60,(b)60
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B
(a)120,(b)120
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C
(a)60,(b)120
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D
(a)120,(b)60
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Solution

The correct option is B (a)60,(b)120
We know that angle of incidence and angle of reflection both are measured from normal which is perpendicular to the plane.
Let,
Angle of incidence =i
Angle of reflection =r
Normal ON is perpendicular to plane.
So, angle of incidence, i=900300=600
We know that angle of incidence=angle of reflection
So, angle of incidence=angle of reflection =600
Hence, angle between incident ray(AO) and reflected ray(OB) is =i+r=600+600=1200
242048_202301_ans_a988f2ed74e141b8bc0696aa59a4ca5c.png

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