Physics behind Eyes and Light
A light bulb rated at
is
% efficient. (i.e.
% of its output is invisible infra-red radiation and only
% is visible light.) A person can see the light with his naked eye from a distance of
on a dark night. If given that the area of the pupil of the person's eye is
, what is the power of the visible light received by the eye of the person?
Details :
- Give your answer in Watts/ .
The answer is 8.0E-13.
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