In Fig. PQ and RS are two mirrors placed parallel to each other. An incident ray \( \mathrm{AB} ...

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In Fig. PQ and RS are two mirrors placed parallel to each other. An incident ray \( \mathrm{AB} \) strikes the mirror PQ at B, the reflected ray moves along the path \( \mathrm{BC} \) and strikes the mirror \( \mathrm{RS} \) at \( \mathrm{C} \) and - again reflects back along CD. Prove that \( \mathrm{AB} \| \mathrm{CD} \).
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