Find the angle of deviation (both clockwise and \( \mathrm{P} \) an...

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Find the angle of deviation (both clockwise and
\( \mathrm{P} \) anticlockwise) suffered by a ray incident on a plane

W mirror, (as shown in figure) at an angle of incidence \( 30^{\circ} \).
(1) \( 120^{\circ} \mathrm{acw} \)
(2) \( 90^{\circ} \mathrm{cw} \)
(3) \( 120^{\circ} \mathrm{cW} \)
(4) None of these
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