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

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Microscope and telescope both will increase

Microscope and telescope both will decrease

Microscope will increase but that of telescope decrease

Microscope will decrease but that of telescope will increase

answer is D.

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Detailed Solution

For microscope m=Lf0Dfc⇒M∝1f0 & For telescope m=f0fe⇒M∝f0.

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