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Prove that a rainbow is the combined eff...

Prove that a rainbow is the combined effect of the refraction, dispersion, and total internal reflection.

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i. The rainbow appears in the sky after a rainfall.
ii. Water droplets present in the atmosphere act as small prism.
iii. When sunlight enters these water droplets it gets refracted and dispersed.
iv. This dispersed light gets totally reflected inside the droplet and again is refracted while coming out of the droplet.
v. As a combined effect of all these phenomena, the seven coloured rainbow is observed.
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