O-LevelPhysicsLight5054/12 · Oct/Nov 2023 · Q281 Mark

The diagram shows a ray of light passing through a triangular glass block. Which angle is the critical angle of light in glass?

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AAngle A, angle of incidence at first surface

BAngle B, angle of refraction at first surface

CAngle C, angle of incidence at second surface (for internal reflection)

DAngle D, angle of reflection at second surface (for internal reflection)

✓ Correct answer

D: Angle D, angle of reflection at second surface (for internal reflection)

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