Cambridge IGCSE. 2025. Physics (0625). May/June - Paper 2 (22) · Multiple Choice (Extended)

Question 21

A ray of light, travelling in air, is incident on an air–glass boundary.

The angles between the incident ray, the refracted ray and the boundary are shown.

Question illustration

Which equation is used to calculate the refractive index $n$ of the glass?

$n = \dfrac{\sin 40^\circ}{\sin 26^\circ}$
$n = \dfrac{\sin 40^\circ}{\sin 64^\circ}$
$n = \dfrac{\sin 50^\circ}{\sin 26^\circ}$
$n = \dfrac{\sin 50^\circ}{\sin 64^\circ}$

Cambridge IGCSE. 2025. Physics (0625). May/June - Paper 2 (22) · Multiple Choice (Extended) - Question 21

Question 21