Answer:
Some substance become luminous when light of a certain wave
length falls upon them. The wave length of the light emitted
by them is always different from that by which they are
illuminated. This phenomenon is called fluorescence e.g.
floorsper, chlorophylle.
length falls upon them. The wave length of the light emitted
by them is always different from that by which they are
illuminated. This phenomenon is called fluorescence e.g.
floorsper, chlorophylle.
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