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The length of the compound microscope is...

The length of the compound microscope is `14 cm.` The magnifying power for relaxed eye is `25`. If the focal length of eye lens is `5 cm`, then the object distance for objective lens will be

A

`1 . 8` cm

B

` 1 . 5` cm

C

`2 .1` cm

D

`2 . 4` cm

Text Solution

Verified by Experts

The correct Answer is:
A
`L_(oo)=v_(o)+f_(e)rArr14=v_(o)+5rArrv_(o)=9cm`
Magnifying power of microscope for relaxed eye
`m=(v_(o))/(u_(o)).(D)/(f_(e))or25=(9)/(u_(o)).(25)/(u_(o))oru_(o)=(9)/(5)=1.8 cm `
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