Question 19
Refraction of LightA boy observes a piece of stone at the bottom of a river 6.0 m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive index of water = 4/3]
- A.4.5 m
- B.5.0 m
- C.5.5 m
- D.8.0 m
Show the answer and explanation
Answer: A (4.5 m)
Explanation
Apparent depth = real depth ÷ refractive index = 6.0 ÷ (4/3) = 4.5 m.