O-LevelPhysicsLight5054/11 · Oct/Nov 2020 · Q281 Mark

A ray of light R is incident on a water-to-air surface with an angle of incidence θ. The angle θ is less than the critical angle c. Which statement describes the subsequent path of R?

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AIt travels back into the water with an angle of reflection equal to c.

BIt travels back into the water with an angle of reflection greater than c.

CIt travels into air with an angle of refraction greater than θ.

DIt travels into air with an angle of refraction smaller than θ.

✓ Correct answer

C: It travels into air with an angle of refraction greater than θ.

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