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Q.

A student performs an experiment in which he puts two mirrors perpendicular to each other as shown in the figure. If angle ‘P’ is 30°, then

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a

∠Q=60∘,∠R=30∘

b

∠Q=30∘,∠R=60∘

c

∠Q=30∘,∠R=45∘

d

∠Q=60∘,∠R=60∘

answer is D.

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Detailed Solution

From the triangle ABC

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30∘+90∘+∠Q=180∘∠Q=180∘−120∘∠Q=60∘∠R+∠Q=90∘∠R=90∘−60∘∠R=30∘.

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