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The focal lengths of the objective and e...

The focal lengths of the objective and eye`-` lens of a microscope are `1cm` and `5 cm` respectively. If the magnifying power for the relaxed eye is `45`, then the length of the tube is

A

`30 cm`

B

`25 cm`

C

`15 cm`

D

`12 cm`

Text Solution

Verified by Experts

The correct Answer is:
C
By using `m_(infty)=((L_(infty)-f_(0)-f_(e)).D)/(1xx5)`
`rArr45((L_(infty)-1-5)xx25)/(1xx5)rArr L_(infty)=15 cm`
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