Question

$\text{Assertion:}$ If objective and eyepiece of a microscope are interchanged, then it can work as a telescope.
$\text{Reason:}$ The objective lens of the telescope has small focal length.

• A. Both the Assertion and reason are true and Reason is correct explanation of Assertion.
• B. Both the Assertion and Reason are true and Reason is not correct explanation of Assertion.
• C. Assertion is true, but Reason is false.
• D. Both the Assertion and Reason are false.

Answer 1

The correct option is D Both the Assertion and Reason are false.

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

Therefore, Both Assertion and Reason are false.