Questions

Smoke emerging from a campfire at the bottom of a hill is being observed by a person at some distance, as shown in the figure. It is evening and the sun has just set behind the hill. Consider regions I and II of the smoke going up the sky

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region I will be slightly brighter than the hill and region II will be slightly brighter than the sky

region I will be slightly darker than the hill and region II will be slightly brighter than the sky

region I will be slightly brighter than the hill and region II will be slightly darker than the sky

region I will be slightly darker than the hill and region II will be slightly darker than the sky

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detailed solution

Correct option is C

Region -I will be slightly brighter than hill. Reason - Due to hot air , bottom of hill is rarer medium and mirage effect occurs , which makes the bottom of hill slightly brighter Region-II will be slightly darker than the sky. Reason : Due to TIR of sunlight region II is devoid of light and due to scattering sky looks a little brighter.