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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,

Options

  1. Abends upward.
  2. Bbecomes narrower.
  3. Cgoes horizontally without any deflection.
  4. Dbends downward.

Correct answer

A. bends upward.

Step-by-step solution

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.

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