A satisfactory photographic print is obtained when the exposure time is 
at a distance of 
from a 60 
lamp. The time of exposure required for the same quality print at a distance of 
from a 120 
lamp is
a)
b)
c)
d)
A satisfactory photographic print is obtained when the exposure time is at a distance of from a 60 lamp. The time of exposure required for the same quality print at a distance of from a 120 lamp is
a)
b)
c)
d)
Question ID - 152815 | SaraNextGen Top Answer
A satisfactory photographic print is obtained when the exposure time is at a distance of from a 60 lamp. The time of exposure required for the same quality print at a distance of from a 120 lamp is
a)
b)
c)
d)
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A satisfactory photographic print is obtained when the exposure time is |
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a) |
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b) |
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c) |
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d) |
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1 Answer
127 votes
Answer Key / Explanation : (d) -
|
(d)
Here So |
is diameter of aperature]
is constant and 
127 votes
Answer Link
127