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Thanks for the comment, Bernard.
If I had access to an optical table then I would make an attempt to
verify my dreamed idea, unless persuaded that it is also silly.
Placing my laser 15 meters away from the setup would produce a wide-
enough beam, without a pinhole.
I
wide laser beam - -> \ - - - leg 1 - - > / - - - > I
I ^ I
I I screen
I I
I I
\ - - - leg 2 - - > /