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ICSE Class 9 Answered

A beam of light is supposed to be deviated through 60 degree by a plane mirror? What must be the angle between mirror and the direction of incident light? Explain with diagram?
Asked by Rp1298908 | 20 Oct, 2018, 12:49: PM
answered-by-expert Expert Answer
As shown in figure, when the incident ray deviates by 60º after reflection means,
reflected ray makes an angle 30° with mirror and other 30° is made with undeviated light ray behind the mirror.
As seen from figure, by symmetry and due to law of reflection ( angle of incidence equals angle of reflection),
 incident ray makes an angle 30° with mirror.
 
angle of incidence = angle of reflection = 60º
Answered by Thiyagarajan K | 21 Oct, 2018, 03:43: AM

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