I have this question asking me to decided whether we can view a a crater on the moon given the turbulence in the atmosphere turns a point source into an extended source of diameter 1". We also found the diffraction limit of the telescope to be 0.57". Now I am confused about why we cant observe this crater on the moon - we know it subtends an angle of 0.93":
this is greater than the minimum angular resolution of the telescope.
the turbulence increases its diameter (due to its affect on the point source), so the angle subtended is still greater than minimum angular resolution implying it can be resolved?