Optics Question 479
Question: 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
Options:
A) 100 sec
B) 25 sec
C) 50 sec
D) 75 sec
Show Answer
Answer:
Correct Answer: C
Solution:
For equal fogging
