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A point source is kept at a distnace 1000m has an illumination I. To change the illumination

A point source is kept at a distnace 1000m has an illumination I. To change the illumination to 16I, the new distance should become

Options

(a) 250 m
(b) 500 m
(c) 750 m
(d) 800 m

Correct Answer:

250 m

Explanation:

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