Hey there,
I have a infinity light microscope and when I raise the condenser (or adjust the focus) to a certain height many spots with a bluish/red tinge appear in the field of view. I have turned the eyepieces, entire condenser (with attached filter), objectives and the spots remain stationary. I can't be sure whether it is dust or not, and I'm concerned they may be scratches, although the microscope is brand new. What do scratches/lens imperfections look like under the microscope? Also is there any other way of locating the problem?
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