Question

Given below are two statements.

Assertion : If objective lens and eyepiece of a compound microscope are interchanged then it can work as telescope.

Reason : The objective lens of the telescope has small focal length.

Based on the above statements, choose the correct alternative.

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

Answer 1

The correct option is D Both assertion and reason are false.

Focal length of lenses are very small in compound microscope and the difference between them $(f_e-f_o)$ is also very small.

While in telescope, objective has a large focal length as compared to eyepiece.

Due to these reasons, if objective lens and eyepiece of a compound microscope are interchanged then it can not work as telescope.

Therefore, both assertion and reason are false.

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