Two vertical plane mirrors are inclined at an angle of \( 60^{\circ} \) with each other. A ray o...

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Two vertical plane mirrors are inclined at an angle of \( 60^{\circ} \) with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
(a) \( 60^{\circ} \)
(b) \( 120^{\circ} \)
(c) \( 180^{\circ} \)
(d) \( 240^{\circ} \)
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