Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules
Interference of the sun light from water surface

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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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