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Light Reflection and Refraction
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09/08/2021 11:57 am
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A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, 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 :
(a) 30° (b) 45° (c) 60° (d) 90°
Draw a ray diagram to illustrate your answer.
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09/08/2021 12:00 pm
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 of 30° with the mirror.
So, the angle of incidence on this mirror is 90° - 30° = 60°.
Hence, the angle of reflection is also 60°.