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Joseph von Fraunhofer - Since the violet rays through...
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. (Joseph von Fraunhofer)

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.

Joseph von Fraunhofer

Related topics

different focal length objective order red see telescope theodolite violet eye-piece lines shorter colors

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