JEE Physics 2

Classical Mechanics Level 3

What should be the angle between two mirrors so that a ray parallel to one mirror may emerge parallel to the second mirror also after suffering 1 reflection from both of the mirrors?

π 3 \displaystyle\frac{\pi}{3} π 4 \displaystyle\frac{\pi}{4} π 2 \displaystyle\frac{\pi}{2} 2 π 3 \displaystyle\frac{2\pi}{3}

Aditya Narayan Sharma by Aditya Narayan Sharma , 21, India

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1 solution

Bhavya Jain
Jul 20, 2016

Let the mirror makes angle A. If light comes parallel to one mirror it forms angle A to the other and by law of reflection , hence the angle the angle between the mirror and reflected ray is also A . similarly after second reflection reflected ray makes an angle A with the mirror .hence 3A=π

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