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Q.

The objective lens of a compound microscope produces magnification of 10. In order to get an over all magnification of 100 when image is formed at 25cm from the eye, the focal length of the eye lens should be (in cm) x9 the value of ‘x’ is _____

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a

60

b

25

c

50

d

15

answer is B.

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Detailed Solution

m0=10,  m=100;

m=m0×me;

100=10×(1+Dfe);

10=1+25fe;fe=259cm

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