Assertion (A): If objective and eye lenses of a micro scope are interchanged then it works as a telescope.
Reason (R):- The objective lens of telescope has small focal length

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Both A and R are true and R is the correct explanation of A.

Both A and R are true and R is not the correct explanation of A

A is true but R is false

Both A and R are false

answer is D.

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Detailed Solution

We cannot interchange the objective and eye lenses of a microscope to make a telescope because focal length of lenses is very small in compound microscope and hence their difference $(f_{0} - f_{e})$ is also very small.

Whereas in telescope, objective has a very large focal length as compared to eye lens. So, difference between focal length of objective and eye piece is large in telescope as compared to the same in case of microscope.

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