The illumination of an object by a light source is directlyproportional to the strength of the source and inverselyproportional to the square of the distance from the source.If two light sources, one three times as strong as the other,are placed 10 ft apart, where should an object be placedon the line between the sources so as to receive the leastillumination?

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter8: Functions
Section8.7: Direct And Inverse Variation
Problem 39PS
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The illumination of an object by a light source is directly
proportional to the strength of the source and inversely
proportional to the square of the distance from the source.
If two light sources, one three times as strong as the other,
are placed 10 ft apart, where should an object be placed
on the line between the sources so as to receive the least
illumination?

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