Optics Question 502

Question: A point source of 100 candela is held 5m above a sheet of blotting paper which reflects 75% of light incident upon it. The illuminance of blotting paper is

Options:

A) 4 phot

B) 4 lux

C) 3 phot

D) 3 lux

Show Answer

Answer:

Correct Answer: B

Solution:

$ I=\frac{L}{r^{2}}=\frac{100}{5^{2}} $ =4 Lux.



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