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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 `

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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`
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Correct Answer - 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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