Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
Infrared radiations from sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Ultraviolet radiations from Sun burn our retina

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Physics
Why does the sea appear blue in colour?

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

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

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

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