Question

A ray of light is incident on a plane mirror, i being the angle of incidence. What is the deviation suffered by the ray of light? [1 MARK]

Answer 1

Explanation: 1 Mark

Deviation suffered = ${180}^o$ - [ Angle of incidence + Angle of reflection]

By law of reflection, angle of incidence = angle of reflection

Therefore deviation suffered =${180}^o$ -[ i + i ]= ${180}^o$ - 2i