Basic Maths and Units and DimensionsHard
Question
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 :
Options
A.bends downwards
B.bends upwards
C.becomes narrower
D.goes horizontally without any deflection
Solution
μ2 > μ1
∴ light bends towards normal
∴ light beam bends upwards (as μ↑with height)
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