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 is

A.            100 sec                                    
B.            25 sec
C.            50 sec                                      
D.            75 sec
Answer» D.            75 sec


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