Q.Write the uses of electron microscope.

The resolving power of any microscope -- how finely it can distinguish two closely spaced points as genuinely separate -- is inversely proportional to the wavelength of the radiation used to illuminate the specimen, so a shorter illuminating wavelength directly buys a higher resolving power and higher achievable magnification. Because an electron's de Broglie wavelength, at typical accelerating voltages, is many thousands of times shorter than the wavelength of visible light used in an ordinary optical microscope, replacing the illuminating light beam with a focused beam of electrons -- exploiting the wave nature of matter directly -- lets an electron microscope achieve far higher resolving power and far higher magnification (routinely well beyond 2,00,000 times in research laboratories) than any optical instrument could ever reach. …