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Question

Figure 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 $$ 30^{\circ} $$
Draw the reflected ray and then find the angle between the incident and reflected rays.
1807072_13ee5c2c648041b3b6a26ea0d1c3f9ca.png


Solution

The angle between the incident and reflected ray = angle of incidence + angle of reflection 
Since angle of incidence = angle of reflection. 
Therefore , angle between the reflected ray and the incidence ray = $$ 60^{\circ} + 60^{\circ} = 120^{\circ} $$ 
1711181_1807072_ans_e29146a1061d4bd1bb4f3507c1faf99d.png

Physics
NCERT
Standard XII

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