First law of illumination - relation of distance between surface and source of light.

Q.  According to the first law of illumination, the illumination of a surface due to a source of light is
- Published on 04 Sep 15

a. Inversely proportional to the distance between the surface and the source of light
b. Inversely proportional to the square of the distance between the surface and the source of light
c. Directly proportional to the distance between the surface and the source of light
d. Directly proportional to the square of the distance between the surface and the source of light

ANSWER: Inversely proportional to the square of the distance between the surface and the source of light

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