Fingerprints on a piece of paper may be detec | vedclass

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(D) Fluorescent materials have the property of absorbing light of shorter wavelengths (like $UV$ light) and re-emitting it as light of longer waveleng

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Ultraviolet light

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(D) Fluorescent materials have the property of absorbing light of shorter wavelengths (like $UV$ light) and re-emitting it as light of longer wavelengths (visible light).When fluorescent powder is sprinkled on fingerprints,the powder adheres to the oils and residues left by the fingers.When this paper is exposed to $Ultraviolet$ light,the powder absorbs the $UV$ radiation and fluoresces,making the fingerprints visible against the background.Therefore,the correct option is $D$.

List-$I$ (Electromagnetic waves)	List-$II$ (Wavelength)
$(a)$ $AM$ radio waves	$(i)$ $10^{-10} \, m$
$(b)$ Microwaves	$(ii)$ $10^{2} \, m$
$(c)$ Infrared radiations	$(iii)$ $10^{-2} \, m$
$(d)$ $X$-rays	$(iv)$ $10^{-4} \, m$

Fingerprints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking at it under:

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