JEE MAIN - Physics (2015 (Offline) - No. 7)
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 :
bends down wards
bends upwards
becomes narrower
goes horizontally without any deflection
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