1.

Correct exposure for a photographic print is 10 seconds at a distance of one metre from a point source of 20 candela . For an equal fogging of the print placed at a distance of 2 m from a 16 candela source, the necessary time for exposure isA. `100 sec`B. `25 sec`C. `50 sec`D. `75 sec`

Answer» Correct Answer - c


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