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Asked by
marc
A lamp is moved from 26 cm to 90 cm above the pages of a book. Compare the illumination on the book before and after the lamp is move.
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Answers
Answered by
DrBob222
The illumination varies as the inverse square of the distance..
1/(26)^2
1/(90)^2
Answered by
shrily
.00148
1.234e-4
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