Physics
The sky appears blue because

In white light, the blue component dominates
It is actually blue
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue

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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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