An incident ray of light strikes water at an angle of 30°. The index of refraction of air is 1.0003, and the index of refraction of water is 1.33.

Assuming the 30° incident angle is measured from the normal, use Snell’s law: n₁ sin θ₁ = n₂ sin θ₂. Thus sin θ₂ = (1.0003/1.33) sin 30° ≈ 0.376, so θ₂ ≈ 22°. The refracted angle is therefore 22°, choice A.

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