Physics
To resolve an object in an electron microscope,

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

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Physics
Rainbow is due to

ionisation of water deposits
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets

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