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References

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  1. O. Kafri, “Noncoherent Method for Mapping Phase Objects,” Opt. Lett. 5, 555 (1980).
    [CrossRef] [PubMed]
  2. Z. Karny, O. Kafri, “Refractive-Index Measurements by Moire Deflectometry,” Appl. Opt. 21, 3326 (1982); I. Glatt, A. Livnat, “Determination of the Refractive Index of a Lens using Moire Deflectometry,” Appl. Opt. 23, 2241 (1984).
    [CrossRef] [PubMed]
  3. R. S. Kasana, K.-J. Rosenbruch, “Determination of the Refractive Index of a Lens using the Murty Shearing Interferometer,” Appl. Opt. 22, 3526 (1983).
    [CrossRef] [PubMed]
  4. The minimum resolvable fringe fraction can be improved by a factor of 10 (m = 0.01) applying image processing or a heterodyne technique, for example, J. Stricker, “Electronic Heterodyne Readout of Fringes in Moire Deflectometry,” Opt. Lett. 10, 247 (1985).
    [CrossRef] [PubMed]

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Figures (3)

Fig. 1
Fig. 1

Setup for measuring the focal length of a converging lens by the beat method.

Fig. 2
Fig. 2

Setup for measuring the focal length of a converging lens of short focal length.

Fig. 3
Fig. 3

Error estimate of the method shown in Fig. 3.

Equations (11)

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f d θ tan α ,
p 1 p = f - l f + d - l ,
1 p = 1 p 1 - 1 p .
f = d p p + l .
f = d p p - l .
f = R - r ,
1 f = 1 f + 2 Δ f + 1 l .
1 l 2 Δ f f 2 .
Δ f m p d f 2 a .
ϕ min λ 2 π a ,
Δ f min λ 2 π f 2 a 2 .

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