Optics Question 511
Question: 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
Options:
A) 50W
B) 72W
C)
D) 200W
Show Answer
Answer:
Correct Answer: D
Solution:
If h 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
