Correct option (a) numerical aperture
Explanation:
Magnification is the power of enlargement. It is the ratio of the size of an object seen under microscope.Magnification depends on focal length of lenses and length of body tube.
It does not depend on Numerical aperture of objective lens and the nature of light being used of illumination.The total magnification of a microscope is determined by multiplying the magnifying power of the objective lens by that of the eye piece.
