6C20.30 PINHOLE DIFFRACTION
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(put laser at end of optics bench, front end should be at ~380 mm) (make divergent beam with 18 mm lens at 440 mm, .04 or .08 mm aperture at 458 mm, 252 mm lens at ~510 mm) (fine tune position of aperture using index card in front of 252 mm lens) (put iris diaphragm at ~550 mm, clamp with binder clip if it must be elevated) |
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