Physics
Purpose of an optical filter is to

Reflect lights of different colours
Refract light of different colours
Transmit or absorb light of different colours
Dispense light into component colours

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Physics
Rainbows are produced when sunlight :

Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

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