Ray Optics

JEE Main level, single correct, medium

6 of 295

Question 6 of 295

When one light ray is reflected from a plane mirror with 30∘30^{\circ} angle of reflection, the angle of deviation of the ray after reflection is:

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Answer: (A) 120∘120^{\circ}

It is given that i=30∘i=30^{\circ}.

The formula for angle of deviation is
δ=180∘−2i\delta =180^{\circ}-2i
Substituting the values,
δ=180∘−60∘\delta =180^{\circ}-60^{\circ}
=120∘=120^{\circ}

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