A) greater is the resolving power
B) smaller is the resolving power
C) greater is the magnifying power
D) smaller is the magnifying power
Correct Answer: A
Solution :
The resolving power of a telescope is its ability to show two distant closely lying objects as just separate. The reciprocal of resolving power is the limit of resolution of the telescope. Limit of resolution\[=1.22\frac{\lambda }{d}rad\] where \[\lambda \] is wavelength and \[d\] the aperture (diameter). Hence, to reduce the limit of resolution of a telescope, we must use objective lens of large aperture\[(d)\]. Larger the aperture of the objective lens, smaller the limit of resolution or greater the resolving power of the telescope.
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