Question

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

• A. Both Assertion and Reason are true and Reason is correct explanation of Assertion
• B. Both Assertion and Reason are true and Reason is not correct explanation of Assertion
• C. Assertion is true but Reason is flase.
• D. Assertion and Reason both are false

Answer 1

The correct option is D Assertion and Reason both are false

If the objective and eye-lens of a compound microscope are interchanged, we'll see a diminished image of the object.

Focal length of both the lenses are very small in a compound microscope and their difference $(f_0-f_e)$ is also very small. Whereas, in telescope the objective has a very large focal length compared to the eye-lens.

So both, assertion and reason, are false.

Hence, $\left(D\right)$ is the correct answer.