The experiment used spectroscope to determine wavelengths of the visible colors. The spectroscope comprised of the cigar box, which has a slot, a source of light, a diffraction grating, and a graph-paper scale. According to Grossie and Underwood, the slot is an entrance slit that allows 1mm of light beam to pass into the box and hits diffraction grating at an incidence angle of 30° (287). Since the beam of light diffracts as it leaves diffraction grating, an observer can view the diffracted light on a graph-paper scale, and note the readings.
In the experiment, when the observer viewed the diffracted light, red, yellow, green, blue-green, blue, and violet are sequential colors that are visible on the graph-paper scale. The procedure of the experiment deviated from printed procedures because the position of the graph-paper scale and observer is unique. However, the experiment did not present any new spectra lines.
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