Discussion
Assertion (A): A fabric treated with an optical brightener can reflect more visible light than falls on it.
Reason (R): Energy absorbed in the ultraviolet is re-emitted in the visible blue region.
Answer: B
Both are true and the reason resolves the apparent paradox: the total energy is not increased, but light is moved from a region the eye cannot see into one it can. Reflectance above a hundred per cent is the visible result.
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