Physics
To resolve an object in an electron microscope,

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

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Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules
Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water

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