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The resolving power, of an electron microscope (using on electron beam accelerated through a potential V) is n times that of a given optical microscope. Given that the resolving power of (any) microscope is inversely proportional to the wavelength, (used by it) the energy of a photon, of the e.m. radiation, used in the given optical microscope, is

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Correct option : (4)

Explanation :

The (deBroglie) wavelength, associated with the electron beam, in the electron microscope, is 

The resolving power of the 

of the electron microscope being n times that of the em waves (used in the optical microscope) the wavelength, λ used in the optical microscope, is λ = n λB 

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