The resolving power of an astronomical telescope is ${\rm{0}}.{\rm{2}}\,\,{\rm{seconds}}$. If the central half portion of the objective lens is covered, the resolving power will be

JEE PHYSICS MCQ: WAVE OPTICS

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The resolving power of an astronomical telescope is

\mathrm{0}.\mathrm{2}\,\,\mathrm{seconds}

. If the central half portion of the objective lens is covered, the resolving power will be

View answer and explanation

Correct option: A

0.1\,\,\sec

The correct answer is B (0.2 sec) because the resolving power of a telescope depends on the diameter of the objective lens, not the area. Covering the central portion doesn't change the effective diameter.

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