Modified method for the determination of relative wave-lengths
Book details
- Title
- Modified method for the determination of relative wave-lengths
- Publication year listed
- 1910
- Format
- Public domain eBook
- Reading access
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- Source record
- View on Archive.org
About this book
Modified method for the determination of relative wave-lengths
Year: 1910
By slight modifications of the Fabry and Perot procedure of employing interference fringes the author claims to have instituted a more sensitive experimental routine, with consequent improvement in the accuracy of determination of secondary standard wave-lengths. The method is characterised by three chief features: (1) The use of reflection fringes converged by a very short focus lens (20 mm.), thus enabling the disappearances of the bright central spot of the interference rings to be accurately counted; (2) the use of the double increment in the distance between the two mirrors instead of the double distance as the difference of path; (3) the use of the method of flexure for the measurement of the fractional part of the order of interf
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