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# 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 100024006001800

A
1000
B
600
C
1800
D
2400
Solution
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#### Fromthefigurea+b=900⇒b=900−aNow,b+60+c=180⇒c=180−60−b=180−(90−a)=30+aNow,d+c=90d=90−c=90−(30+a)=60−aThus,intrianglePQR∠Q=2a∠R=2d=2(60−a)=120−2aso,angle∠QPTis=∠Q+∠R=120Now,angleofdeviation=reflex∠QPT=360−120=240∘Hence,theoptionDisthecorrectanswer.

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