: Ah yes, : : I had forgotten the physics experiment of years ago in which we made : a difraction image using a point ( well almost ) source and an : intervening object. : With sufficient exposure time on photo paper ( I think the time was : about 10 minutes ) one obtained a shadow image of the object : surrounded by 'halo' rings of diminishing intensity as you have : described. So a sufficiently sensitive sensor could image such : 'halos' and record them. : : Nice that you pointed that out. you're describing an Airy disk pattern of diffraction, not a halo or halation http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/cirapp2.html and a nice explanation: http://www.oldham-optical.co.uk/Airy%20Disk.htm all sensors will record this, paper just recorded it slowly in your experiment as the paper is slow k
