The Elementary Theory of the Symmetrical Optical Instrument
The Elementary Theory of the Symmetrical Optical Instrument
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It is therefore a suitable quantity to take as a measure of the extent to which the material behaves differently to the two standard colours, and is called the " dispersive power " of the sub- stance. It is usually written (A/O/fc-l) (93), the operator symbol A being used to denote the increment of the function of /x on which it operates when /* is changed from /^ to /* 2, and the suffix being dropped in the case of colour No. 3. For brevity the dispersive power is denoted by the symbol w. It m...ust be noted that a numerical value of TO for any particular substance is meaningless unless it is accompanied by a precise definition of the standard colours to which it refers.
The dispersive power w is usually a very small quantity. When colour No. 1 corresponds to the C line (in the red), colour No. 2 to the F line (in the blue), and colour No. 3 to the D line (in the yellow), the values of w for some different kinds of Jena glass are roughly 1/67, 1/55, 1/65, 1/51, 1/44.
48. Powers of a thin lens for different colours.
What to read after The Elementary Theory of the Symmetrical Optical Instrument?
You can find similar books in the "Read Also" column, or choose other free books by J G John Gaston Leathem to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is therefore a suitable quantity to take as a measure of the extent to which the material behaves differently to the two standard colours, and is called the " dispersive power " of the sub- stance. It is usually written (A/O/fc-l) (93), the operator symbol A being used to denote the increment of the function of /x on which it operates when /* is changed from /^ to /* 2, and the suffix being dropped in the case of colour No. 3. For brevity the dispersive power is denoted by the symbol w. It m...ust be noted that a numerical value of TO for any particular substance is meaningless unless it is accompanied by a precise definition of the standard colours to which it refers.
The dispersive power w is usually a very small quantity. When colour No. 1 corresponds to the C line (in the red), colour No. 2 to the F line (in the blue), and colour No. 3 to the D line (in the yellow), the values of w for some different kinds of Jena glass are roughly 1/67, 1/55, 1/65, 1/51, 1/44.
48. Powers of a thin lens for different colours.
What to read after The Elementary Theory of the Symmetrical Optical Instrument?
You can find similar books in the "Read Also" column, or choose other free books by J G John Gaston Leathem to read onlineMoreLess
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