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)

90?

Answer 2

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
$= 90? - 0? = 90?$