O Levels Physics (5054)•5054/11/O/N/20

Explanation
Refraction from denser to rarer medium bends light away from the normal Steps:
- Ray originates in water (denser, n ≈ 1.33) incident on water-air interface (air rarer, n ≈ 1).
- Since i < c (≈ 48°), total internal reflection does not occur; ray refracts into air.
- Apply Snell's law: n_water sin i = n_air sin r.
- n_water > n_air implies sin r = (n_water / n_air) sin i > sin i, so r > i.
Why B is correct:
- Snell's law requires r > i when light travels from denser to rarer medium, bending away from normal.
Why the others are wrong:
- A: Reflection angle equals i (law of reflection), not c; ray also refracts since i < c.
- C: r is larger than i, not smaller (opposite of denser-to-rarer bending).
- D: Duplicate of B; no unique distinction.
Final answer: B
Topic: Refraction of light
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