Find the minimum magnification of a microscope, whose objective's numerical aperture is \( \sin ...

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Find the minimum magnification of a microscope, whose objective's numerical aperture is \( \sin \alpha=0.24 \), at which the resolving power of the objective is totally employed if the diameter of the eye's pupil is \( d_{0}=4.0 \mathrm{~mm} \)
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