The magnifications produced by a convex lens for two position of an object are 4 and 3, respectively. If the distance of separation between the two positions of the object is 
, then the focal length of the lens is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnification by a lens is given as
and 
By lens formula, we have
...(iii) [from eq. (i)]
Similarly, 
...(iv) [from eq. (ii)]
Using Eqs. (iii) and (iv),
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