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 and telescope both will decrease.

microscope will decrease but that of telescope will increase.

answer is D.

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Detailed Solution

Magnifying power of a microscope, m=LfoDfewhere f0 and fe are the focal lengths of the objective and eyepiece respectively and L is the distance between their focal points and D is the least distance of distinct vision. If f0 increases, then m will decrease. Magnifying power of a telescope, m=f0fewhere f0 and fe are the focal lengths of the objective and eyepiece respectively. If f0 increases, then m will increase.

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