Question

during rainbow formation does every raindrop experiences internal reflection ? and why is the rainbow is in arc shape​

Answer 1

The glow is formed by light passing through raindrops, not reflected by them. ... Double rainbows are caused by light being reflected twice inside the raindrop. As a result of this second reflection, the spectrum of the secondary rainbow is reversed: red is on the inner section of the arch, while violet is on the outside.If we draw rays of sunlight that reflect at 42 degrees into your eyes then those rays start to look like they form a circular arc in the sky. So the reflection gives you the shape of the rainbow, while the refraction gives you the colours of the rainbow

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