Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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

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

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