Physics
An electron microscope gives higher magnification than an optical microscope, because :

It uses more powerful lenses
The electrons have more energy than the light particles
The velocity of electron is smaller than that of visible light
The wavelength of electrons is smaller as compared to the wavelength of visible light

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
None of these
Both A & B
The wavelength of the electrons must be greater than the diameter of the object.

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