O-LevelPhysicsLight5054/12 · Oct/Nov 2021 · Q261 Mark

Light rays are deviated by a prism. The deviation angle d is measured for light rays of different frequency, including blue light and red light. Which graph of d against frequency is correct?

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AGraph showing deviation d decreasing as frequency increases

BGraph showing deviation d initially decreasing then increasing

CGraph showing deviation d initially increasing then decreasing

DGraph showing deviation d increasing as frequency increases

✓ Correct answer

D: Graph showing deviation d increasing as frequency increases

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