The graph shows, how the inverse of magnification 
produced by a convex thin lens, with variation in object distance u. What was the focal length of the lens used?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Equation of straight line AB,
From, 
Comparing this with equation of straight line, 1/f is the slope of line, which is b/c. So, the focal length of the lens used is 
.
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