If incident ray MP and reflected ray \( \mathrm{QN} \) are parallel...

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If incident ray MP and reflected ray \( \mathrm{QN} \) are parallel to each other, find the angle \( \theta \) between the mirrors.
\( \mathrm{P} \)
W
(A) \( 60^{\circ} \)
(B) \( 45^{\circ} \)
(C) \( 90^{\circ} \)
(D) \( 180^{\circ} \)
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