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

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

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Can be of any shape

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