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Q.

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

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a

microscope will decrease but that of telescope will increase.

b

microscope will increase but that of telescope decrease.

c

microscope and telescope both will decrease.

d

microscope and telescope both will increase.

answer is D.

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Detailed Solution

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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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