AssertionThe focal length of the objective of the telescope is larger than that of eyepiece. Reason The resolving power of telescope increases when the aperture of objective is small.

Question

AssertionThe focal length of the objective of the telescope is larger than that of eyepiece. Reason The resolving power of telescope increases when the aperture of objective is small. (A) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (B) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (C) Assertion is correct but Reason is incorrect. (D) Assertion is incorrect but Reason is correct.

Tardigrade Admin · Accepted Answer

The magnifying power of telescope is m=(fo/fe). So, for high magnification, the focal length of objective lens should be larger than eyepiece. Resolving power of a telescope =(d/1.22 λ). For high resolving power, diameter (d) of objective should be higher.

Q. AssertionThe focal length of the objective of the telescope is larger than that of eyepiece.
Reason The resolving power of telescope increases when the aperture of objective is small.

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

Assertion is correct but Reason is incorrect.

Assertion is incorrect but Reason is correct.

The magnifying power of telescope is $m = \frac{f _{o}}{f _{e}}$ .
So, for high magnification, the focal length of objective lens should be larger than eyepiece.
Resolving power of a telescope $= \frac{d}{1.22 λ}$ .
For high resolving power, diameter $(d)$ of objective should be higher.

Q. AssertionThe focal length of the objective of the telescope is larger than that of eyepiece. Reason The resolving power of telescope increases when the aperture of objective is small.