Question

The angle of incidence for a ray of light having zero reflection angle is (b) 30° (c) 45° (d) 90° The image formed by concave mirror is real, inverted and of the ok​

Answer 1

When the light ray is incident normally on a plane mirror then by using laws of reflection angle of incidence is equal to angle of reflection. Hence, as the angle of incidence is zero degree angle of reflection is zero degree. Thus, reflected ray will reflect back in same path as that of incident ray.

Answer 2

The angle of incidence for a ray of light having zero reflection angle is (a) zero

Explanation:

The angle of incidence is equal to the angle of reflection regardless of the shape of the reflecting surface.

According to the law of reflection, the angle of incidence and the angle of reflection for a light ray, reflecting off of a surface is always equal, irrespective of the surface such as plane mirror, concave or convex mirror.

It can be represented as:

$\angle i\;=\;\angle r$

where

$i$ is the angle of incidence

$r$ is the angle of reflection