Hemlock Mike said:That effect can only be seen with laser type light. What that is amounts to the peaks and dips you see in water if you drop two stones in to the puddle.
With light, the waves are interfering with peaks and nulls - the nulls appear black.
Mike
Hemlock Mike said:I live near the edge of a 3600 acre pond -- Clear Lake, Iowa ;D
No joke -- This pond which they call a lake is about 7 feet deep average
Mike