The star in the bottom of the Northern Cross asterism is actually a binary pair. The photo graph in Figure Q25.14 came from a telescope with a mirror 10 inches in diameter. Which feature of the telescope is more important in enabling it to resolve the pair when your eye sees them as one point of light,
(a) magnification  
(b) the size of the mirror or primary lens? Explain your answer. You can assume fluctuations in the atmosphere as described in Section 24.7 are negligible in this case.