Are of light is incident on a plane mirror at an angle of 60 degree what is the deviation produced by the mirror?

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10 Questions 50 Marks 7 Mins

CONCEPT:

• Plane Mirror: A plane mirror is a mirror with a flat (planar) reflective surface.

• According to the law of reflection, the incident ray, reflected ray, and the normal to the mirror, all lie on the same plane.
• Also the angle of the incident (i) = angle of reflection (r)

The  deviation angle is given by:

δ = 180 - (i + r)

CALCULATION:

Angle of the incident (i) = Angle of reflection (r) = 30°

∴ i = 30° so r = 30°

deviation angle (δ) = 180 - (i + r)

δ = 180 - (30° + 30°)

δ = 120° 

So the correct answer is option 4.

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