Question 28
Refraction of LightWhich of the following may be used to explain a mirage? I. Layers of air near the road surface have varying refractive indices in hot weather II. Road surfaces sometimes become good reflectors in hot weather. III. Light from the sky can be reflected upwards after coming close to the road surface.
- A.II only
- B.II and III only
- C.I and III only
- D.I, II and III
Show the answer and explanation
Answer: C (I and III only)
Explanation
Hot air near the road has a lower refractive index, so light from the sky bends and is totally internally reflected upwards, looking like water. The road itself does not become a mirror.