The diffraction-limited angular resolution of one telescope is 0.1 arcsec and that of another is 0.2 arcsec. What does this mean?

Question

Quizplus · Accepted Answer

A smaller angular resolution means that the telescope can distinguish between two objects that are closer together in the sky. Therefore, the telescope with 0.1 arcsec has better resolution than the one with 0.2 arcsec. Diffraction is a real limitation for telescopes, so option C is incorrect. While there are other forms of resolution to consider, angular resolution is important for many astronomical observations, so option D is incomplete.

The Diffraction-Limited Angular Resolution of One Telescope Is 0