O-LevelPhysicsLight5054/12 · May/June 2020 · Q311 Mark
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?
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AW has a greater refractive index than X and angle y is equal to the critical angle.
BW has a greater refractive index than X and angle z is equal to the critical angle.
CX has a greater refractive index than W and angle y is equal to the critical angle.
DX has a greater refractive index than W and angle z is equal to the critical angle.
✓ Correct answer
C: X has a greater refractive index than W and angle y is equal to the critical angle.
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