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In a compound microscope, the focal leng...

In a compound microscope, the focal lengths of two lenses are `1.5 cm` and `6.25 cm` an object is placed at `2 cm` form objective and the final image is formed at `25 cm` from eye lens. The distance between the two lenses is

A

`6.00 cm`

B

`7.75cm`

C

`9.25 cm`

D

`11.00 cm`

Text Solution

Verified by Experts

The correct Answer is:
D
`L=u_(o)+u_(e)=(u_(o)f_(o))/((u_(o)-f_(o)))+(f_(e)D)/(f_(e)+D)`
`impliesL=(2xx1.5)/((2-1.5))+(6.25xx25)/((6.25+25))=11cm`
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Knowledge Check

  • In a compound microscope, the focal length of the objective and the eye lens are 2.5 cm and 5 cm respectively. An object is placed at 3.75cm before the objective and image is formed at the least distance of distinct vision, then the distance between two lenses will be ( i.e. length of the microscope tube )

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    D
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