Resolution of Images
Can we distinguish two distant point objects?
If their diffraction patterns overlap, they appear as one object
Rayleigh’s criterion: central maximum of the diffraction pattern of one object is centered on the first minimum of the other
angular separation must be greater than sin?R = 1.22(?/d) ~ ?R
if we use waves of smaller ?, we have greater resolvability
electrons have a wavelength ~ 10-5 times smaller than light ==> electron microscope