A ray of light is incident on a face of equilateral triangle at an incident angle 50. At this angle minimum deviation occurs. This deviation is
Answer & explanation
Correct answer: option 2
A = 60°
At minimum deviation: i = e = 50°
Also, $r_1=r_2=\frac{A}{2}$ = 30°
$\delta_{\min }$ = i + e - A = 100° - 60° = 40°