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Dispersion of Light

Arrange the c...

Question

Arrange the colours green, red, and indigo in the order of decreasing wavelength.

A

Indigo, Green, Red

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B

Red, Green, Indigo

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C

Green, Red, Indigo

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D

Red, Indigo, Green

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Solution

The correct option is B
Red, Green, Indigo

The spectrum of white light is a combination of violet, indigo, blue, green, yellow, orange and red (VIBGYOR). Among these 7 colours, red has the largest wavelength and violet has the smallest wavelength.
Hence, the correct order in terms of decreasing wavelength is red, green, indigo

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