The illumination at a point is inversely proportional to the square of the distance of the point

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The illumination at a point is inversely proportional to the square of the distance of the point from the light source and directly proportional to the intensity of the light source. If two light sources are s feet apart and their intensities are I1 and I2, respectively, at what point between them will the sum of their illuminations be a minimum?
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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