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The luminous flux of a monochromatic source of 1W is 450 lumen/watt. Find the relative luminosity at the wavelength emitted.

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asked Mar 29, 2018 in Physics by Nisa (2,540 points) ● 1 ● 3
The luminous flux of a monochromatic source of 1W is 450 lumen/watt. Find the relative luminosity at the wavelength emitted.

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answered Mar 29, 2018 by rubby (7,550 points) ● 1 ● 3 ● 5
selected Apr 1, 2018 by Vikash Kumar
 
Best answer
The luminous flux of the given source of 1W is 450 lumen/watt
Relative luminosity =Lumin ous flux of the source of given wavelength / Luminous flux of 555 nm source of same power
=450/685
= 66%
[Since, luminous flux of 555nm source of 1W = 685 lumen]
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