If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
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a
150
b
200
c
250
d
400
answer is B.
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Detailed Solution
m∞=v0u0×Dfe From 1f0=1v0−1u0 ⇒1(+1.2)=1v0−1(−1.25)⇒υ0=30 ∴|m∞|=301.25×253=200