If the ratio of magnifications produced by a simple microscope in near point adjustment and far point adjustment is 6/5 , then the focal length of the lens is, (Take, D= 25 cm.)
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a
5 cm
b
10 cm
c
55 cm
d
0.2 cm
answer is A.
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Detailed Solution
Given : 65=1+DrDf Or 65=fD+1 Or fD=65−1=15 or f=D5=5cm