If the focal length of objective lens is increased then magnifying power of

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microscope will decrease but that of telescope will increase.

microscope will increase but that of telescope decrease.

microscope and telescope both will decrease.

microscope and telescope both will increase.

answer is D.

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Detailed Solution

Magnifying power of telescope, $M_{T} = - \frac{f_{0}}{f_{e}}$
and for microscope,
$M_{m} = - \frac{L}{f_{o}} (1 + \frac{D}{f_{e}})$
$∴$ If f₀ is increased, magnifying power of telescope will increase and that of microscope will decrease.
Hence, option (4) is correct.

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