A ray of light strikes a plane mirror at angle of incidence of 50° , gets reflected from this plane mirror and then strikes the second plane mirror placed at right angle to the first mirror . What's the angle of reflection fir the second mirror
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Explanation:
Ray PQ strikes the mirror AB at Q and gets reflected along QR according to the laws of reflection. The ray QR incident on mirror BC makes an angle of
50
°
with the mirror. This is because angle of incidence is the angle between incident ray and normal.
So, the angle of incidence on this mirror is
90°-50° =40°
Hence, the angle of reflection is also
40°
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