Question 29
Refraction of LightA beam of light is incident from air to water at an angle of 30°. Find the angle of refraction if the refractive index of water is 4/3.
- A.15°
- B.18°
- C.22°
- D.24°
Show the answer and explanation
Answer: C (22°)
Explanation
sin r = sin 30° ÷ (4/3) = 0.5 × 0.75 = 0.375, so r ≈ 22°.