An Introduction to the Theory of Optics
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In our eReader you can find the full English version of the book. Read An Introduction to the Theory of Optics Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Introduction to the Theory of Optics
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Y 70] DIFFRACTION GRATINGS 139 the lengths between the marks on their upper surfaces are nearly in the ratio of 1 : 2. Let /, /' be the lengths between the marks, and M, M' the number of wave-lengths contained in the distance between the reflecting surfaces. Three marks A, B, C are made on a straight bar such that the length AB is very nearly equal to BG, A direct comparison with the comparator then gives l=AB + a, l=C+b, l' = AC+c, where a, b, c are lengths of a few microns only. From this we ...deduce 2l-l' We have also, if A be the sum measured in wave-lengths of the distances between the marks and reflecting surfaces of each of the two plates used, l=(M so that, eliminating I and /', The difference M' - 2M is measured optically in the manner already described. This completes the description of the operations necessary to determine the standard metre in terms of the wave-length.
As a result of the measurements the wave-length of the red cadmium line was found to be A = 0-64384696 cms.
What to read after An Introduction to the Theory of Optics?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Schuster to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Y 70] DIFFRACTION GRATINGS 139 the lengths between the marks on their upper surfaces are nearly in the ratio of 1 : 2. Let /, /' be the lengths between the marks, and M, M' the number of wave-lengths contained in the distance between the reflecting surfaces. Three marks A, B, C are made on a straight bar such that the length AB is very nearly equal to BG, A direct comparison with the comparator then gives l=AB + a, l=C+b, l' = AC+c, where a, b, c are lengths of a few microns only. From this we ...deduce 2l-l' We have also, if A be the sum measured in wave-lengths of the distances between the marks and reflecting surfaces of each of the two plates used, l=(M so that, eliminating I and /', The difference M' - 2M is measured optically in the manner already described. This completes the description of the operations necessary to determine the standard metre in terms of the wave-length.
As a result of the measurements the wave-length of the red cadmium line was found to be A = 0-64384696 cms.
What to read after An Introduction to the Theory of Optics?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Schuster to read onlineMoreLess
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