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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`

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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RESONANCE ENGLISH-GEOMATRICAL OPTICS -Exercise-1
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  15. A converging beam of light rays in incident on a concave spherical ...

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  16. A point object is placed on the principle axis at 60cm in fornt ...

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  17. A man uses a concave mirror for shaving. He keeps his face at a dist...

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  18. Two spherical mirros (convex and concave) having the same focal leng...

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  19. A light ray falling at an angle of 45^@ with the surface of a clean sl...

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