SATHEE: Optics Question 507

Optics Question 507

Question: A screen receives 3 watt of radiant flux of wavelength 6000 Å. One lumen is equivalent to $1.5 \times 10^{- 3} w a t t$ of monochromatic light of wavelength 5550 Å. If relative luminosity for 6000 Å is 0.685 while that for 5550 Å is 1.00, then the luminous flux of the source is

Options:

A) $4 \times 10^{3} l m$

B) $3 \times 10^{3} l m$

C) $2 \times 10^{3} l m$

D) $1.37 \times 10^{3} l m$

Show Answer

Answer:

Correct Answer: D

Solution:

$φ = \frac{3}{1.5 \times 10^{- 3}} \times 0.685$

$= 1.37 \times 10^{3} l u m e n$

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Optics Question 507

Question: A screen receives 3 watt of radiant flux of wavelength 6000 Å. One lumen is equivalent to 1.5×10−3watt of monochromatic light of wavelength 5550 Å. If relative luminosity for 6000 Å is 0.685 while that for 5550 Å is 1.00, then the luminous flux of the source is

Options:

Answer:

Solution:

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Question: A screen receives 3 watt of radiant flux of wavelength 6000 Å. One lumen is equivalent to $1.5 \times 10^{- 3} w a t t$ of monochromatic light of wavelength 5550 Å. If relative luminosity for 6000 Å is 0.685 while that for 5550 Å is 1.00, then the luminous flux of the source is