Monochromatic light refers to light that has ___.

red and blue colour

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white and orange colour

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only one colour

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all colours

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Solution

The correct option is C only one colour
Monochromatic light refers to light of a single wavelength, i.e constitutes only one colour.
White light has wavelength ranging from $400 n m$ to $700 n m$ and contains different colours in it. Hence, white light is not monochromatic but polychromatic instead.

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