![A ray of light that strikes a plane mirror PQ at an angle of incidence of 30](https://www.gkseries.com/blog/wp-content/uploads/2022/05/A-ray-of-light-that-strikes-a-plane-mirror-PQ-at-an-angle-of-incidence-of-30.png)
Q. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:
A. 30o
B. 45o
C. 60o
D. 90o
Answer: 60o