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A convex lens of focal length f produces...

A convex lens of focal length f produces a real image m times the size of an object, then the distance of the object from the lens is

A

(m + 1)f

B

(m - 1)f

C

`((m+1)/m)f`

D

`((m-1)/m)f`

Text Solution

Verified by Experts

The correct Answer is:
C
We have,
magnification = `f/(f+u)=-m`(given)
or f = -mf - mu
or mu = -(m + 1)f
`thereforeu=-((m+1))/mf`
So, distance of the object from the lens is `((m+1)/m)f`.
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Knowledge Check

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