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A simple microscope has a magnifying pow...

A simple microscope has a magnifying power of 4.125, when the image is formed at the distance of distinct vision. What is the focal power of the lens ?

A

8.5 D

B

12.5 D

C

14.5D

D

10.5D

Text Solution

Verified by Experts

The correct Answer is:
B
`M=4.125`
When the image is formed at D, by a simple microscope,
`M.P.=1+(P)/(f) therefore 4.125=1+(25)/(f) therefore 3.125=(25)/(f)`
`therefore f=(25)/(3.125)=8`
`therefore P=(100)/(f)=(100)/(8)=12.5D`
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