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JEE · NEET Previous Year Question

$It the focal length of objective lens is increased then magnifying power of :$

Topic: NEET PYQ

Answer: D. Full step-by-step solution below.

A $microscope will increase but that of telescope decrease$
B $microscope and telescope both will increase$
C $microscope and telescope both will decrease$
D $microscope will decrease but that of telescope will increase.$

Correct answer: D

Solution

(d)M.P. of a microscope = (\frac{L}{f _{0}}) (\frac{D}{f _{e}}) if f0 ↑ \Rightarrow M.P. of the microscope will decrease M.P. of telescope = \frac{f _{0}}{f _{e}} if f0↑ \Rightarrow M/O. of telescope will increase.

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