Does total internal reflection necessary condition to form rainbow
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Yes
Bcoz if light entering the water droplet doesn't get TIR then the white light of the sun will not split in to its constituent colour.
Bcoz if light entering the water droplet doesn't get TIR then the white light of the sun will not split in to its constituent colour.
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Total Internal Reflection has nothing to do with rainbows (see second edit below). Each raindrop amplifies light that is reflected in certain directions. Red light is amplified the most at around 42 degrees, and violet at around 40. So if you look at raindrops along an arc that is 42 degrees off of the line from the sun to you, you see red. If you look at 40 degrees, you see mostly violet.
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