question_answer

What is the sum of angle of incidence, angle of reflection and angle of deviation equals to?

Answer:

We know that,\[d=180-2i\text{ }or\text{ }d=180-(i+r)\]                                                                 \[[\because i=r]\] \[\Rightarrow \]\[d+i+r=180{}^\circ .\] Therefore, the sum of angle of incidence, angle of reflection and angle of deviation is equal to 1800.