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A convex lens of focal length f produces...

A convex lens of focal length f produces an image `1//n` times the size of the object. The distance of the object from the lens is

A

`(n+1)f`

B

`(n-1)f`

C

`nf`

D

`f/n`

Text Solution

Verified by Experts

The correct Answer is:
A
`"Magnification"=(h.)/h=v/u`
`impliesv/u=1/nimpliesv=u/n`
`"For convex lens, u is - ve in the lens formula."`
`1/v-1/(-u)=1/fimplies1/v+1/u=1/f`
`impliesn/u+1/u=1/fimplies(n+1)/(u)=1/f`
`impliesu=f(n+1)`
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