Interference.
The aqueous glycerol solution, the reflected light.

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Zeiss Epiplan-Neofluar 5x/0,15
Moderators: rjlittlefield, ChrisR, Chris S., Pau
I use any lenses with extension to infinity.Pau wrote: A pair of questions about your camera coupling:
Do you put any lens between the microscope photo tube and the camera?
Is the camera image parfocal with the viewing eyepieces?