Assertion: If objective and eye lenses of a microscope are interchanged then it can work as telescope.
Reason: The objective of telescope has small focal length.

Both assertion and reason are correct and reason is the correct explanation of the assertion

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Both assertion and reason are correct, but reason is not the correct explanation of the assertion.

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Assertion is correct, but reason is incorrect.

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Assertion is incorrect, but reason is correct.

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Both assertion and reason are incorrect.

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Solution

The correct option is E Both assertion and reason are incorrect.
We cannot interchange the objective and eye lens of a microscope to make a telescope. The reason is that the focal length of lenses in microscope are very small. of the order of mm or a few cm and the difference $(f_{o} - f_{e})$ is very small, While the telescope length as compared to eye lens of microscope.

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Assertion: If objective and eye lenses of a microscope are interchanged then it can work as telescope.Reason: The objective of telescope has small focal length.

Assertion: If objective and eye lenses of a microscope are interchanged then it can work as telescope.
Reason: The objective of telescope has small focal length.