Question

Two vertical plane mirrors are inclined at an angle of 600 with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is

A
600
B
1000
C
1800
D
2400
Solution
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Fromthefigurea+b=900b=900aNow,b+60+c=180c=18060b=180(90a)=30+aNow,d+c=90d=90c=90(30+a)=60aThus,intrianglePQRQ=2aR=2d=2(60a)=1202aso,angleQPTis=Q+R=120Now,angleofdeviation=reflexQPT=360120=240Hence,theoptionDisthecorrectanswer.

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