Question

A ray of light is incident at 50. on the middle of one of the two mirrors arranged at an angle of 60 between them .the ray then touches the second mirror ,get reflected back to the first mirror ,making an angle of incidence of:

Answer 1

Given Data:

Angle of incidence, $i={50}^o$

Angle between two mirrors, $={60}^o$

Step 1: Angle of incidence after reflection:

From given ray diagram we can say,

In $\Delta ABC$

${90}^o-\theta +140+{20}^o={180}^o$

$\theta =250-180={70}^o$