Infinite conjugation

In the conics section we discussed the property of parabolas. Since one of its conjugates is at infinity, it will form a perfect image from the infinite conjugate at focus. This is the basis for a single mirror telescope. This telescope is either used at this prime focus, or sometimes a folding flat mirror (Newtonian telescope) is used to fold the beam to a convenient location for a camera or the... 

Bonchev, D. and Mekenyan, O. (1980) Topological approach to the calculation of the m-electron energy and energy gap of infinite conjugated polymers. Z. Naturforsch., 35, 739-747. 

Fig. 7.5 Transfer system for use at conjugate foci made of two lenses corrected for infinite conjugate ratio. The focal lengths of lens 1 and lens 2 are f and f2, respectively...

Fig. 7.6 Checking an achromatic doublet corrected for infinite conjugate ratio. If the convergent-beam side is directed to the paper the image remains undistorted when the paper comes close to the focus left). Otherwise the image is distorted middle and right)...

Sehmidt and Springborg have developed a method for the calculation of static hyperpolarizabihties of infinite conjugated polymers in which an external electric field is ineluded direetly in the DFT formalism. In the simpler case where the field does not break the translational symmetry they have applied the theory to tranj-polyaeetylene and polyearbonitrile and demonstrated the effects of heteroatoms in the backbone. They find that the properties change only by a small amount in the presence of a strong field. 

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