Question

what is rainbow?????​

Answer 1

RainBow Is A Mixture Of All Colours Like Blue , Purple , Red , Green etc.,

An oxygen concentrator is a device that concentrates the oxygen from a gas supply by selectively removing nitrogen to supply an oxygen-enriched product gas stream. Two methods in common use are pressure swing adsorption and membrane gas separation. 

Answer 2

Explanation:

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A rainbow is a multicolored arc made by light striking water droplets. The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a precise angle (42 degrees). Rainbows are the result of the refraction and reflection of light.

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