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Q.

A rainbow is an optical and meteorological phenomenon that is caused by:

 A.

diffusion of sunlight through water droplets

 B.

reflection, refraction and dispersion of light in water droplets

 C.

ionisation of water deposits

 D.

absorption of sunlight in minute water droplets

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Solution:
Option(B) is correct

A rainbow is an optical and meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.

It takes the form of a multi coloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

Rainbows can be full circles; however, the average observer sees only an arc formed by illuminated droplets above the ground, and centred on a line from the sun to the observer's eye.


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