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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. O. Kafri, I. Glatt, “Moire Deflectometry: A Ray Deflection Approach to Optical Testing,” Opt. Eng. 24, 944 (1985).
    [CrossRef]
  3. I. Glatt, O. Kafri, “Determination of the Focal Length of Nonparaxial Lenses by Moire Deflectometry,” Appl. Opt. 26, 2507 (1987).
    [CrossRef] [PubMed]

1987 (1)

1985 (1)

O. Kafri, I. Glatt, “Moire Deflectometry: A Ray Deflection Approach to Optical Testing,” Opt. Eng. 24, 944 (1985).
[CrossRef]

1980 (1)

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Figures (2)

Fig. 1
Fig. 1

Schematic setup for measuring focal length. The two gratings, G1 and G2, are separated by a distance Δ. The distance from the test lens to the first grating is l and f is the focal length.

Fig. 2
Fig. 2

Setup for thick lenses. Note that the back focal length is being measured when the aperture stop is placed after the lens.

Equations (9)

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p 1 = p ( f l Δ ) f l .
1 p = 1 p 1 p 1 = Δ p ( f l Δ ) .
N = a Δ p ( f l Δ ) .
a = a ( f l Δ ) / f .
f = a Δ p N ,
d f f = d N N .
d f = f 2 π N = p f 2 2 π a Δ .
d f = λ 2 π f 2 a m p , m = 1 , 2 , 3 , .
d f = λ 2 π f 2 a 2 .

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