Question 7 of 191
On a hot summer night, the refractive index of air is the smallest near the ground and increases with a height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam,
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Answer: (A) bends upward.
Every point on the horizontal ray of light behaves as a source of light. Thus, the secondary rays which are directed towards denser medium would bend towards the normal. These phenomena cause the bending of the rays upwards.
