The relative luminosity of wavelength 600 nm is 0.6. Find the radiant flux of 600 nm needed to produce the same brightness sensation as produced by 120 W of radiant flux at 555 nm
A
50 W
B
72 W
C
D
200 W
Text Solution
Verified by ExpertsThe correct answer is:
D
If η η is the luminous efficiency of the bulb then.
luminous flux by 120 watt at 555 nm 
Let bulb of P watt at 600 nm produces the same luminous flux as by 120 watt at 555 nm then
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