Question

Why must the microscope have both effective magnification and resolution to be useful

Answer 1

A larger magnification does not always mean that the resulting image has a higher information content and more detail. The maximum useful magnification for compound light microscopes is around 1000x. ... If the resolution of the 400x microscope is also high, however, then one would see more with the 400x instrument.

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Answer 2

In the same way that light has a wavelength, the movement of high-speed electrons also has a wavelength. The wavelength of electrons is thousands of times shorter than visible light, so scientists predicted that electron microscopes would be able to resolve objects that are thousands of times smaller. A larger magnification does not always mean that the resulting image has a higher information content and more detail. The maximum useful magnification for compound light microscopes is around 1000x. ... If the resolution of the 400x microscope is also high, however, then one would see more with the 400x instrument.