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Quotes from Prismatic and Diffraction Spectra: Memoirs — Joseph von Fraunhofer

1787–1826 Germany

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2 quotes

Since the violet rays through the objective of the theodolite telescope have a shorter focal length than the red rays, it is evident why the eye-piece must be displaced in order to see plainly the lines in the different colors.

Prismatic and Diffraction Spectra: Memoirs (1899)

Up to the present time, in experiments on diffraction there has been no instrument, except a magnifying-glass, which could be used with profit; and this may perhaps be one of the reasons why in this field of physical optics we are so backward, and why we know so little of the laws of this modification of light.

Prismatic and Diffraction Spectra: Memoirs (1899)

Attribution

Quotes and notes from Wikiquote: Joseph von Fraunhofer (page history), available under CC BY-SA 4.0.