phase change refers to the changes in the amplitude, and wavelength of the light when it passes from one medium to the other...
Fritts Zernike invented the phase contrast microscope in 1932. He received a Nobel Prize for it in 1953.
phase contrast
halo formation
Frits Zernike
The microscope that takes advantage of differences in the refractive indexes of cell structure is the phase contrast microscope. The microscope that is used to see internal structure of cells in a natural state is also a phase contrast microscope.
diaphragm with annular stop and phase plate in the objective lens
In 1932
The microscope that is used to see internal structures of cells in a natural state is the compound light microscope. The microscope has a lens and light that allows it to see the internal structures of a cell clearly.
Using a phase-contrast microscope
A phase microscope is also a contrast microscope. It empasizes slight differences in a specimen's capacity to bend light waves,enhancing light and darker regions without the use of stains.
Stereomicroscope, Compound Microscope, Phase-contrast microscope, electron microscope, Scanning-electron microscope, Transmission electron microscope, Confocal-scanning microscope. THESE ARE JUST SOME. :)
There are six different types of microscopes used in the life science. There is the light microscope, phase contrast microscope, fluorescent microscope, electron microscope, atomic force microscope, and scanning tunnelling microscope.