The wavelength of the light is usually represented in

micron

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fermi

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nanometer

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angstrom

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Solution

The correct option is D
angstrom

Angstrom denoted by $\overset{o}{A}$ is the unit of length in which the wavelength of light is usually expressed.
$1 \overset{o}{A} = 10^{- 10} m .$
It is used to express wavelengths of visible light, ultraviolet (UV) light, X rays, and gamma rays.
Hence, the correct option is (D).

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