Atmospheric optics: What physical effects produce a rainbow in the sky? Explain the formation mechanism in raindrops for primary rainbow appearance. Choose the correct option.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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ASingle refraction only
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BDiffraction by droplets
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CRefraction, dispersion, and internal reflection of sunlight in raindrops
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DScattering only (Rayleigh scattering)
Answer
Correct Answer: Refraction, dispersion, and internal reflection of sunlight in raindrops
Explanation
MechanismSunlight refracts into a raindrop, disperses into colors, reflects internally (typically once for the primary bow), and refracts out, concentrating rays near ~42° for red.
Final AnswerRefraction, dispersion, and internal reflection of sunlight in raindrops