Question

A light ray enters a prism through the side PR. PQR is a cross section of the prism. The emergent ray lies along the boundary OQ. ∠P = 90° and PQ = PR. The ray diagram has been given.


ii. What is the refractive index of the prism?

[1 mark]

• A. 1.00
• B. 1.73
• C. 1.33
• D. 1.41

Answer 1

The correct option is D 1.41

$Refractiveindex=\frac{1}{\sin \left(criticalangle\right)}=\frac{1}{\sin 45°}=\sqrt{2}=1.41$