Physics
The blue colour of sky is due to

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

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
Both A & B
None of these
The wavelength of the electrons must be greater than the diameter of the object.

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