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

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Microscope will increase but that of telescope decrease.

Microscope and telescope both will increase.

Microscope will decrease but that of telescope increase.

Microscope and telescope both will decrease.

answer is D.

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Detailed Solution

for telescope $m = \frac{f_{0}}{f_{e}}$
for microscope $m = - \frac{V}{u} (1 + \frac{D}{f_{e}})$

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