Concept:The apparent pool of water on a hot road is a mirage, caused by refraction of light through air layers of different temperatures.
Explanation:On a sunny day, the air just above the road becomes hotter and less dense than the air above it.
Light rays from the sky travel downwards through these layers of air.
As they pass through the hot air layer near the road, their direction changes due to refraction.
This refracted light reaches the eye as if it has come from the road surface.
The brain misinterprets it as light reflected from a pool of water.
Therefore, the motor boy sees the image of the sky on the road, appearing like water.
This is why the phenomenon depends on both the hot road surface and the varying air temperature.
Answer:D. The sun rays from the sky were passing from a hot air (layer) to cold layer.