Question

4.A ray of light that strikes a plane mirror PQ at an angle of incidence of 30 degree, 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:4.A ray of light that strikes a plane mirror PQ at an angle of incidence of 30 degree, 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:​

Answer 1

Answer:

the angle of reflection will be 60°

Answer 2

Answer:

60 degree

Explanation:

BN || QR

.'. angle NCB = angle BCQ = 30 degree

.'. angle MCB = 90 -30 = 60 degree

=> angle i = angle r = 60 degree