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Q.

A magnifying glass is made of a combination of a convergent lens of power 20D and divergent lens of power 4D. If the least distance of distinct vision is 25cm. The magnifying power is

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a

7

b

8

c

3

d

5

answer is B.

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Detailed Solution

Peff=P1P2;Peff=16D;f=10016cm Magnifying power =1+Df=1+25100/16=5

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