O-LevelPhysicsLight5054/11 · Oct/Nov 2019 · Q271 Mark
Light is incident at 90° on the surfaces of two glass prisms P and Q. The critical angle for light travelling from glass into air is 42°. Where does total internal reflection occur?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Ain P and in Q
Bin P only
Cin Q only
Din neither P nor Q
✓ Correct answer
A: in P and in Q
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