I've got some negative images that are on glass. So, effectively,
instead of negatives on film, they are on glass about 1/16" thick.

I've just got a regular scanner, with basic scanning programme.

How do I scan?

I put glass on scanner, put on top of that white sheet of paper, then
close scanner lid, but all I got was dark image. Light in scanner must
not be reflecting back from all area of the glass.

TIA.