. The electron microscope, its development, present performance and future possibilities . Fig. 15a cal aberration would have very poor resolution. The effect corresponding to inelastic collisions is absent in ordinary micro- scopy, as light in general does not change its wavelength in the object. An exception is fluorescence microscopy. In this case, it would be possible to imitate the working of the electron micro- scope by reversing the usual process. Instead of observing the visible fluorescence through chromatically corrected objectives, one could use lenses corrected for spherical aberra
. The electron microscope, its development, present performance and future possibilities . Fig. 15a cal aberration would have very poor resolution. The effect corresponding to inelastic collisions is absent in ordinary micro- scopy, as light in general does not change its wavelength in the object. An exception is fluorescence microscopy. In this case, it would be possible to imitate the working of the electron micro- scope by reversing the usual process. Instead of observing the visible fluorescence through chromatically corrected objectives, one could use lenses corrected for spherical aberration, but de- liberately uncorrected for chromatic aberration, and record the negative of the fluorescence, by taking photographs, in which the fluorescent particles would appear absorbing. But it would be, of
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