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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 1 cm 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`

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The correct Answer is:
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