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  2. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

  3. Three-mirror anastigmat - Wikipedia

    en.wikipedia.org/wiki/Three-mirror_anastigmat

    Eisenberg – Pearson Two-mirror Three-surface Eisenberg solid three mirror anastigmat. A variation of the Korsch design is the Two-Mirror three-surface telescope [6] introduced by Shai Eisenberg and Earl T. Pearson in 1987. Employing the Korsch equations with minimal modifications, the number of mirrors is reduced from three to two by ...

  4. Optical resolution - Wikipedia

    en.wikipedia.org/wiki/Optical_resolution

    The original application called for placing the chart at a distance 26 times the focal length of the imaging lens used. The bars above and to the left are in sequence, separated by approximately the square root of two (12, 17, 24, etc.), while the bars below and to the left have the same separation but a different starting point (14, 20, 28, etc.)

  5. Cassegrain reflector - Wikipedia

    en.wikipedia.org/wiki/Cassegrain_reflector

    Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.

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  7. Here are 12 well-known companies that went bankrupt in 2024 - AOL

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