LIGHT filters of coloured glass and gelatin are in common use for visual and photoelectric photometers. They are satisfactory, on the whole; but the glass filters are easily broken, and those of ...
Who would have thought you could make a game out of an optical bench? [Chris Mitchell] did, and while we were skeptical at first, his laser Light Bender game has some potential. Just watch your eyes.
Colored filters enhance lunar details by improving contrast and reducing glare. Different colored filters highlight various features; yellow and blue filters are particularly useful. Neutral-density ...
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