Discussion
A Rainbow is formed by the______of light by water droplets.
Answer: D
The answer is Dispersion and total internal reflection.
Sunlight entering a raindrop is refracted and split into its colours (dispersion), reflected from the back surface of the drop, and refracted again as it leaves. The textbook account names this internal reflection as total internal reflection, and the paper follows that account.
Dispersion alone would not send the light back towards an observer standing with the sun behind him, and reflection alone would not separate the colours, so each single process is incomplete. Scattering is what makes the sky blue; it does not form a rainbow.
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