Question

If the angle between the two plane mirrors and the incident ray is 40°, what are the angles of incidence and reflection?

Answer 1

Given that the glancing angle = 40 degrees

Angle of incidence = Angle of reflection = 90 - Glancing Angle

Angle of Incidence = 90 - 40 = 50

So the Angle of Incidence and Angle of Reflection are both 50 degrees

Answer 2

The angle between the incident ray and the mirror is 40°.

Now, at the point of incidence on the mirror imagine a perpendicular line to the surface of the mirror. This line is referred to as normal. The angle between the incident ray and the normal is called the angle of incidence. This ray after being incident on mirror will get reflected.

There is a law in physics called law of refection. This law states that the angle of reflection is equal to angle of incidence.

So first we must figure out the angle of incidence.

Angle of incidence,

i = 90° - 40° = 50°

The angle of reflection,

r = 50°                                      (since, Angle of i = Angle of r)

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