Write about electron microscope.

Explanation

This is the direct application of wave nature of particles। The wave nature of the electron is used in the construction of microscope called electron microscope।
The resolving power of a microscope is inversely proportional to the wave length of the radiation used for illuminating the object under study। Higher magnification as well as higher resolving power can be obtained by employing the waves of shorter wavelengths।
De Broglie wavelength of electron is very much less than (a few thousands less) that of the visible light being used in optical microscopes
As a result, the microscopes employing de Broglie waves of electrons have very much higher resolving power than optical microscope
Electron microscopes giving magnification more than 2,00,000 times are common in research laboratories।

Working:
The electron beam passing across a suitably arranged either electric or magnetic fields undergoes divergence or convergence thereby focussing of the beam is done
The electrons emitted from the source are accelerated by high potentials। The beam is made parallel by magnetic condenser lens। When the beam passes through the sample whose magnified image is needed, the beam carries the image of the sample
With the help of magnetic objective lens and magnetic projector lens system, the magnified image is obtained on the screen। These electron microscopes are being used in almost all branches of science.