Question

3
If the angle between the plance mirror
and the incident xay is 40', What
are the angles ot incidence and
reflection?

Answer 1

Answer:

40 is the angle of both incidence and reflection.

Answer 2

Answer:

∠i = ∠r = 50°

Explanation:

Given:

Angle between the plane mirror and the incident ray = 40°

To find:

∠i, ∠r

Solution:

Angle between the normal and the plane mirror = 90°

Angle between the incident ray and the normal (∠i) + Angle between the incident ray and the plane = Angle between the normal and the plane mirror

Angle between the incident ray and the normal (∠i) = Angle between the normal and the plane mirror - Angle between the incident ray and the plane mirror

∠i = 90° - 40°

∠i = 50°

According to the laws of reflection,

∠i = ∠r

So, ∠r = 50°

∴ The angle of incidence and angle of reflection = 50°.