A convex lens of focal length f produces a real image n times the size of an object, then the distance of the object from the lens is :
(n+1)f
(n+1n)f
(n−1)f
(n−1n)f
A
(n+1)f
B
(n−1n)f
C
(n−1)f
D
(n+1n)f
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Solution
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Magnification m=−vu=n ⟹v=−nu Using lens formula: 1v−1u=1f
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