In a diffraction spectrum the diffraction is proportional to the wavelength, and the spectrum is said to be "normal." [Please select]
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The shortest waves of the visible spectrum are those of the extreme violet; the longest, those of the extreme red; while the other colours are of intermediate pitch or wavelength. [Please select]
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If both series start at the same moment, one of them being, at starting, a whole wavelength in advance of the other, they also add themselves together, and we have an augmented luminous effect. [Please select]
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The difference of path between the waves which pass along this line and those from the two margins is, in the case here supposed, half a wavelength. [Please select]
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