SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:
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30o
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45o
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60o
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90o
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Explanation:
Detailed explanation-1: -For a mirror, the angle of incidence is equal to the angle of reflection. For a plane mirror: If the incident ray falls along the normal, the angle of incidence is 0 degrees, not 90 degrees.
Detailed explanation-2: -Ray AB strikes the mirror PQ at B and gets reflected along BC according to the laws of reflection. The ray BC incident on mirror QR makes an angle 30∘ with the mirror. So, the angle of incidence on this mirror is 90∘−30∘=60∘.
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