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Why do high altitude areas have brighter sunlight and lower temperatures as compared to the plains?
 

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When sunlight reaches us, it undergoes refraction through several layers of the atmosphere. The relative degree of refraction at higher altitude is less than at lower altitude. Due to this, sunlight appears brighter at high altitudes than in plains. Temperature reduces with increase in altitude. Due to this, higher altitudes have a lower temperature compared to the plains. 

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