Why rainbow is curved? It could …
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Posted by Abhishek Kumar 7 years, 2 months ago
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Naveen Sharma 7 years, 2 months ago
Ans. A rainbow is a reflection of sunlight, diffracted into its spectrum, on water droplets in the atmosphere. The spherical shape of water droplets aligns the spectrum into a band of parallel rays.
Since it is a reflection of the sun, a rainbow can only be seen at the geometric locus of points in the sky that form a specific angle between the sun, themselves and the observer.
That locus is a circle and at the center of the circle should be the point in sky directly opposite to the sun, since the droplets reflect the light backwards at a 40-42 degree angle from the incident trajectory.
Fully circular rainbows have been observed from airplanes, with the airplane's shadow at their center.
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