SATHEE: Optics Question 486

Optics Question 486

Question: The maximum illumination on a screen at a distance of 2 m from a lamp is 25 lux. The value of total luminous flux emitted by the lamp is

[JIMPER 1997]

Options:

A) 1256 lumen

B) 1600 lumen

C) 100 candela

D) 400 lumen

Show Answer

Answer:

Correct Answer: A

Solution:

$I = \frac{L}{r^{2}}$

$\Rightarrow L = I . r^{2}$

$= 22 \times 2^{2} = 100$ .

Now $φ = 4 π L = 4 \times 3.14 \times 100$ = 1256 lumen.

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Optics Question 486

Question: The maximum illumination on a screen at a distance of 2 m from a lamp is 25 lux. The value of total luminous flux emitted by the lamp is

Options:

Answer:

Solution:

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