54.
Rainbow is produced when Sunlight falls on drops of rain, which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer:

56.
Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because

59.
The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?

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