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A ray of light is incident at an angle of $20^{\circ}$ to the normal. What is the deviation caused due to reflection?

$(a)\;20^{\circ} \\ (b)\;80^{\circ} \\ (c)\;120^{\circ} \\ (d)\;140^{\circ} $

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The original path of light is AC.
The reflected ray deviates from its original path by $\delta =180 -(20+20)$
$\qquad=140 ^{\circ}$
Hence d is the correct answer.
answered Jan 15, 2014 by meena.p
edited Jul 28, 2014 by meena.p

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