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A 20 D lens is used as a magnifier. Wher...

A 20 D lens is used as a magnifier. Where should the object be placed to obtain maximum angular magnification? (Given, D=25 cm).

A

4.17 cm

B

4.7 cm

C

4.07 cm

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Focal length of the lens,
`f=(1)/(20)m=(100)/(20)cm = 5 cm`
Maximum angular magnification is obtained when final image is formed at D. Hence,
`(1)/(-25)-(1)/(-u_(o))=(1)/(5)rArr u_(o)=4.17 cm`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-RAY OPTICS-EXERCISE 2 (MISCELLANEOUS PROBLEMS)
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