Question

if a ray of light is incident on a plane mirror such that it makes an angle of 30 with the mirror than what will be the angle of reflection

Answer 1

Angle of reflection is the angle that a reflected ray of light makes with the normal to the reflecting surface. The normal is an imaginary line which is perpendicular to the reflecting surface.

The angle of reflection is always equal to the the angle of incidence, which is the angle that the incoming ray, called incident ray makes with the normal.

(Please note that the angle of incidence and angle of reflection are always defined in terms of angle the ray makes with the normal. There is nothing like "angle of reflection with respect to mirror)

The angle of incidence can be calculated from the angle incident rays makes the reflection surface as:

Angle of incidence = 90 - Angle made with reflecting surface

The angle with the reflecting surface, that is mirror, is given as 30 degrees.

Therefore:

Angle of incidence = 90 - 30 = 60 degrees

And

Angle of reflection = angle of incidence = 60 degrees

hope its clear!

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