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Q.

Two plane mirrors are arranged at right angles to each other as shown in figure. A ray of light is incident on the horizontal mirror at an angle 'θ' . For what value of θ the ray emerges parallel to the incoming ray after reflection from the vertical mirror            

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a

all of these

b

30°

c

60°

d

45°

answer is D.

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Detailed Solution

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As shown in fig. both incident ray & reflected ray makes an angle 90θ

with horizontal & are anti parallel for all values of θ

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