alleryLight travelling from air strikes a water surface at 0° to the normal. The angle of refraction is:
A0°
B45°
C30°
DEqual to the critical angle
Answer & Solution
Correct answer: A. 0°
1. A ray along the normal has incidence angle = 0.
2. By Snell's law, sin(r) = (n₁/n₂) sin(0) = 0.
3. So r = 0°: the ray passes straight through with no bending.
_Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.3_
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