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

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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