Question

Assertion :To increase resolving power of a telescope, the aperture ($a$) of the objective should be large. Reason: Resolving power of the telescope is given by $\frac{2a}{1.22\lambda }$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

The resolving power of a telescope is given as $\frac{a}{1.22\lambda }$

where $a$ is the aperture of the objective lens

Hence to increase the resolving power of the telescope, the aperture of objective should be large.