(Last Updated On: January 21, 2020)

#### Problem Statement: EE Board October 1993

At any distance x from the source of light, the intensity of illumination varies directly as the intensity of the source and inversely as the square of x. Suppose that there is a light at A, and another at B, the one at B having an intensity 8 times that of A. The distance AB is 4 m. At what point from A on the line AB will the intensity of illumination be least?

- A. 2.15 m
- B. 1.33 m
- C. 1.50 m
- D. 1.92 m

#### Problem Answer:

At **1.50 m ** from A on the line AB will the intensity of illumination be least

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