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A wire mesh consisting of very small squ...

A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm kept close to the eye. The magnification produced by lens is

A

5

B

8

C

10

D

20

Text Solution

Verified by Experts

The correct Answer is:
A
`n=-8 cm. f=10cm`
As `(1)/(v)-(1)/(u)=(1)/(f)`
:. `(1)/(v)=(1)/(f)+(1)/(u)+(1)/(-8)=(1)/(10)-(1)/(8)=(4-5)/(40)=(-1)/(40)`
or, `v=-40cm`
Magnification produced by the lesn, `m(v)/(u)-(40)/(-8)=5`
This is a virtual inmage, erect and on the same side as the object.
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