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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.
17 years ago

Answers

Answered by DrBob222
The illumination varies as the inverse square of the distance..
1/(26)^2
1/(90)^2
17 years ago
Answered by shrily
.00148
1.234e-4
12 years ago

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