[quote That's interesting Do I assume the light, on fluorescence, radiates inefficiently in all directions.
I would assume it would radiate in all directions, however if you have a thin piece and the image is focused on it, you might be able to see the image. Could be fun to try but I don't have access to the lapidary equipment needed to give it a go...
-------------------- Steve
16" Meade LightBridge (Beowulf)
10" Hardin DSH, StarMax 127mm Mak, PST H-a
Oberwerk 11 x 70 binocs, Tasco 10 x 50 binocs