A rainbow is caused by

reflection

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refraction

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dispersion

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tyndall effect

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Solution

The correct options are
A reflection
B refraction
C dispersion
A rainbow is a 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 multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

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