On a hot summer night, the refractive index of air is smallest near the ground and increases with 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:
A
goes horizontally without any deflection
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B
bends downwards
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C
bends upwards
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D
becomes narrower
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Solution
The correct option is C bends upwards According to Huygen’s principle, each point on wave front behaves as point source of light.