Richard J Kinch wrote:
Christopher Tidy writes:


According to some articles I've found online, certain metallurgical
microscopes use a plain glass sheet which works by total internal
reflection rather than a semi-silvered mirror. If that's the case with
my microscope, it would make the glass much easier to find. I might even
be able to use a circular glass cover slip.


Or even try cutting some 0.015 Mylar sheet (overhead transparencies) with
scissors. Not really optically flat, but maybe worth experimenting with.

I had wondered about this, but like you I was concerned about the
flexibility of the sheet. It might not matter, as the sheet only
reflects the illuminating light, not the image, but I'd prefer to do a
good job.

Best wishes,

Chris