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References

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  1. D. C. Stockbarger, Rev. Sci. Inst. 7, 133 (1936).
    [Crossref]
  2. F. H. Perrin, J. Opt. Soc. Am. 28, 88 (1938).
    [Crossref]
  3. Hardy and Perrin, The Principles of Optics, Chapter VI.

1938 (1)

F. H. Perrin, J. Opt. Soc. Am. 28, 88 (1938).
[Crossref]

1936 (1)

D. C. Stockbarger, Rev. Sci. Inst. 7, 133 (1936).
[Crossref]

Hardy,

Hardy and Perrin, The Principles of Optics, Chapter VI.

Perrin,

Hardy and Perrin, The Principles of Optics, Chapter VI.

Perrin, F. H.

F. H. Perrin, J. Opt. Soc. Am. 28, 88 (1938).
[Crossref]

Stockbarger, D. C.

D. C. Stockbarger, Rev. Sci. Inst. 7, 133 (1936).
[Crossref]

J. Opt. Soc. Am. (1)

F. H. Perrin, J. Opt. Soc. Am. 28, 88 (1938).
[Crossref]

Rev. Sci. Inst. (1)

D. C. Stockbarger, Rev. Sci. Inst. 7, 133 (1936).
[Crossref]

Other (1)

Hardy and Perrin, The Principles of Optics, Chapter VI.

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Figures (3)

Fig. 1
Fig. 1

Positive element, lithium fluoride. R1 = 17.0 mm. R2 = −65.9 mm. Negative element, quartz cut with lens axis parallel to optic axis. R3 = −39.4 mm. R4 = 90.0 mm. Diameter 10 mm. Focal length 100 mm.

Fig. 2
Fig. 2

Calculated variation in focal length with wave-length of three lithium fluoride-quartz doublets. Focal length of positive element at 5000A: A, 35.9 mm; B, 34.4 mm; C, 32.7 mm. Curve B refers to the doublet shown in Fig. 1.

Fig. 3
Fig. 3

Spectrograms showing effect of variation in focal length on sharpness of lines. A and C were made with a crystal-quartz lens. B was made with the lithium fluoride-quartz doublet.

Tables (1)

Tables Icon

Table I Optical constants.