Question

A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The emergent ray of light makes an angle of 30° with incident ray. The angle made by emergent ray with second face of prism be

• A. 0°
• B. 90°
• C. 45°
• D. 30°

Answer 1

Answer: (B)

Here, $i=60°,A=30°,\delta =30°,e=?$
As $i+e=A+\delta$
$\therefore e=A+\delta -i=30°+30°-60°=0°$
Angle of emergent ray with second face of prism $=90°-0°=90°$