Question

What is the angle of reflection when a ray of light is incident normally on a plane mirror?

Answer 1

In the case of reflection and refraction, the angle is always measured from the normal to the incident point. So, when ray incidents normally, that means angle is 0°. And according to the law of reflection, ∠i = ∠r. So, the angle of reflection will be 0° that means it is reflected back on the same path.