Question

एक समतल दर्पण पर आपतित किरण 60°का कोण बानाती है तो परावर्तन कोण क्या होगा

Answer 1

60° because in laws of reflection I=r

Answer 2

According to the law of reflection, when light falls upon a plane mirror  the incident ray , reflected ray and the normal ray lie in the plane of incidence and the angle of incidence is equal to the angle of reflection. Here, the angle of incidence is 60°. Hence, the angle of reflection is also 60°.