Abstract

The important features of two achromatic slit images, which appear near minimum deviation for an isosceles prism, are described and applied for refractive index determinations. Either of these images can be utilized in a prism orientation technique equally suited for visible and non-visible wavelengths. This technique has been tested by determining the refractive index curves (0.4 to 2µ) of isosceles prisms prepared from six Eastman Kodak glasses. Another tested technique is presented whereby the angular separation of these two images is used to determine the angles of an equilateral prism with a negligible uncertainty.

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  1. H. Kayser, Handbuch der Spectroscopie (Leipzig, 1900), Vol I., p. 258.
  2. J. W. Gifford, Proc. Roy. Soc. (London) 70, 330 (1902).
  3. For small ε and δ, n sin(r-ε)=sin(i-δ) minus n sinr = sini yields Eq. (3).
  4. The alternative procedure of superimposing I and R has the virtue that the I and R waves can both ben centered, whereas E and R cannot. Errors due to incorrect focusing are thus avoided. Some measurements were made in this fashion (using a Na source to intensify the I ray without affecting the Hg or He spectrum line being observed). The precision of the spectrometer, however, did not warrant the use of the weaker, less convenient I ray.

Gifford, J. W.

J. W. Gifford, Proc. Roy. Soc. (London) 70, 330 (1902).

Kayser, H.

H. Kayser, Handbuch der Spectroscopie (Leipzig, 1900), Vol I., p. 258.

Other

H. Kayser, Handbuch der Spectroscopie (Leipzig, 1900), Vol I., p. 258.

J. W. Gifford, Proc. Roy. Soc. (London) 70, 330 (1902).

For small ε and δ, n sin(r-ε)=sin(i-δ) minus n sinr = sini yields Eq. (3).

The alternative procedure of superimposing I and R has the virtue that the I and R waves can both ben centered, whereas E and R cannot. Errors due to incorrect focusing are thus avoided. Some measurements were made in this fashion (using a Na source to intensify the I ray without affecting the Hg or He spectrum line being observed). The precision of the spectrometer, however, did not warrant the use of the weaker, less convenient I ray.

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