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

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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