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On a hot summer night, the refractive in...

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

becomes nerrower

B

goes horizontally without any deflection

C

bends downwards

D

bends upwards

Text Solution

Verified by Experts

The correct Answer is:
D

Ray `2` will travel faster than `1`,
so beam will bend upward
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