O-LevelPhysicsLight5054/12 · May/June 2015 · Q251 Mark

A ray of light in glass is incident on the surface at an angle c. The angle c is the critical angle. Which diagram shows what happens to the light?

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Aray of light partially reflects and partially refracts, with the refracted ray leaving the glass

Bray of light partially reflects and partially refracts, with the refracted ray bending towards the normal

Cray of light partially reflects and partially refracts, with the refracted ray travelling along the glass-air boundary

Dray of light undergoes total internal reflection, with no light leaving the glass

✓ Correct answer

D: ray of light undergoes total internal reflection, with no light leaving the glass

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