Question

wave and optics

Figure beside shows light reflecting from two perpendicular reflecting surface A and B. Find the angle between the incoming ray i and the outgoing ray r'.

Answer 1

using the figure

angle of incidence of the light ray on the mirror will be 90 - $\theta$

then the out going ray r¹ makes an angle 90 - ( 90 - $\theta$ ) = $\theta$

so with the Y - direction or vertical direction and it is anti parallel to incoming light ray

then can say the angle between the incident ray i and out going ray r¹ is 180^o