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Measurement of very small distances  Very small  distance  like size of molecules, radius of atoms etc, cannot be measured with the help of instruments like vernier calliperse, screw gauge, spherometer etc. Even optical  microscope  cannot measure these distances. In optical microscopes cannot measure these distances. In optical microscopes, visible light is used whose wavelength is of the order of 6 × 10 -7  m. Hence, we cannot see as object by an optical microscope whose dimension is less than 6 × 10 -7  m. Light will pass through such object instead of being scattered. Measurement of very small distances Electron  microscope  is a device which can measure distance of the order of 10-8m. In this microscope, we use an accelerated beam of electrons instead of visible light while focusing is done with the help of electric and  magnetic fields . Electron microscope heaving resolution of A, can resolve  atoms  and m...