The Formula for Resolving Power of a Lens Is L/2NA

The formula for resolving power of a lens is l/2NA (wavelength /2 x numerical aperture) . What does this say about resolving power?

A) the smaller the wavelength the greater the resolving power of the lens
B) it is not related to the lens' numerical aperture
C) we can not precisely calculate the resolving power of a lens
D) a larger resolving power is indicative of a better lens

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