Physics
Oil raise up the wick in a lamp. The principle involves

volatility of oil
the diffusion of oil through the wick
the liquid state of oil
capillary action phenomenon

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
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 and internal reflection.

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