Question

An isosceles totally reflecting prism can reflect rays through an angle of :

विकल्प

• 60°

• 90°

• 180°

• both 90° and 180°

Answer 1

Both 90° and 180°

Explanation:

A right-angled isosceles prism can turn a ray through 90° by one total internal reflection. Two successive total internal reflections can turn it through 180°. Hence, both angles are possible.