Conjugate focus

Definitions

• Webster's Revised Unabridged Dictionary
• Conjugate focus (Opt) See under Focus.
• Conjugate focus (Opt) the focus for rays which have a sensible divergence, as from a near object; -- so called because the positions of the object and its image are interchangeable.
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Usage

In literature:

In other words, a focus is such a point that every line through it is perpendicular to its conjugate line.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6" by Various
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In science:

Next we focus on the conjugate Fueter equations, especially in their form (39)–(40). A bicomplex function satisfying these equations is said to be conjugate regular.
Bicomplex algebra and function theory
Since the theory of random conjugate spaces has played an essential role in both the development of the theory of RN modules and their applications to conditional risk measures, our previous works have been focused on the theory of random conjugate spaces of RN modules [14, 15, 22–25].
Ekeland's Variational Principle for An $\bar{L}^{0}-$Valued Function on A Complete Random Metric Space
Focusing at the central point the same frequency as in (a) and (b) via phase conjugation is displayed in (c) and (d) with 66 and 30 input points, respectively.
Focusing through random media: eigenchannel participation number and intensity correlation
Remarkably, all these tra jectories are focused on the conjugate plane, and the rotation between the ob ject and its image is determined by the Larmor rotation of electrons with respect to the optical axis .
Observation of the Larmor and Gouy Rotations with Electron Vortex Beams
An additional reversed OAP mirror within the wavefront sensor corrects the non-common path optical errors introduced by the 10 km conjugate focus of the laser reflecting off of the first OAP mirror.
Bringing the Visible Universe into Focus with Robo-AO
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