A) \[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\]
B) \[\frac{1}{\upsilon }-\frac{1}{u}=\frac{1}{f}\]
C) \[\frac{1}{\upsilon }+\frac{1}{u}=-\frac{1}{f}\]
D) none of these
Correct Answer: B
Solution :
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