Physics · May / June 2020 · Paper 12 · Question 31

The diagram shows a ray of light incident on the boundary between two mediums W and X. The mediums have different refractive indexes. Some light is reflected and some passes along the surface between the two mediums. Angle y is greater than angle z. Which statement is correct?

1. AW has a greater refractive index than X and angle y is equal to the critical angle.
2. BW has a greater refractive index than X and angle z is equal to the critical angle.
3. CX has a greater refractive index than W and angle y is equal to the critical angle.
4. DX has a greater refractive index than W and angle z is equal to the critical angle.

As printed in the paper