Optics Question 510

Question: A point source of light moves in a straight line parallel to a plane table. Consider a small portion of the table directly below the line of movement of the source. The illuminance at this portion varies with its distance r from the source as

Options:

A) E1r

B) E1r2

C) E1r3

D) E1r4

Show Answer

Answer:

Correct Answer: C

Solution:

I=Lhr3



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