Question

Two vertical plane mirrors are inclined at an angle of ${60}^o$ with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other mirror. Then the resultant deviation is

• A. ${60}^O$
• B. ${120}^O$
• C. ${180}^O$
• D. ${240}^O$

Answer 1

Answer: (D)

${240}^O$

$\delta =(360-2\theta )=(360-2\times 60)={240}^o$