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     EduGorilla 
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    On a hot summer night, the refractive index of air is the 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

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    1. becomes narrower
    2. goes horizontally without any deflection
    3. bends downwards
    4. bends upwards
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