Keywords: Diffraction sunlight 0.02mm.jpg en Diffraction of sunlight through a 0 02 mm 20 micron slit; top trace unfiltered other traces filtered by bandpass filter Wratten filters no 29 15 13 and 47A ; a composite of five images made on the camera CCD without a lens Own Pieter Kuiper 2009-08-22 Diffraction |