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Results 261 - 270 of 346 for Lens
  • What is an Aperture?
    Article - 31 Dec 2013
    An aperture is an opening or a hole through which light passes by. In an optical system, the aperture is the opening that defines the cone angle of a set of light rays that converges at a focal point...
  • Primary and Secondary Principal Planes
    Article - 30 Dec 2013
    The principal planes are two hypothetical planes found in a lens system at which all the refraction is deemed to occur.
  • What is Magnification Power?
    Article - 28 Dec 2013
    Magnifying power is defined as the ratio between the dimensions of the image and the object. The process of magnification can occur in lenses, telescopes, microscopes and even in slide projectors....
  • Diverging Lens - Definition and Characteristics
    Article - 28 Dec 2013
    A lens is an optical device that transmits light by refraction; the incident beam is either converged or diverged based on the nature of the lens.
  • Diopter (unit) - Definition and Applications
    Article - 28 Dec 2013
    Diopter is the unit of measurement of the optical power of lens or a curved mirror. In terms of numerical value, it is equal to the reciprocal of the focal length of a lens of curved mirror measured...
  • Depth of Focus - Introduction and Meaning
    Article - 27 Dec 2013
    Depth of focus in optics is a measure of the tolerance of placement of the image plane with respect to the lens. In photography, depth of focus refers to the tolerance of the films displacement within...
  • Catadioptric System Definition and Applications
    Article - 27 Dec 2013
    Catadioptric systems may be defined as optical systems that make use of lenses and mirrors for the formation of images.
  • Astigmatism in Optical Systems
    Article - 27 Dec 2013
    An optical system that is plagued with astigmatism focuses two orthogonal axes of light at two different distances.
  • Cassegrain Telescope - Definition and Applications
    Article - 23 Dec 2013
    The Cassegrain telescope is an astronomical reflecting telescope in which the light is incident on a large concave paraboloid mirror and reflected onto a smaller convex hyperboloid mirror.
  • The History of the Catoptric Optical System
    Article - 23 Dec 2013
    Catoptrics has been introduced way back in time by the ancient Greeks. There were two main ancient Greek texts that mentioned catoptrics.Catoptric systems are those optical systems that employ only...

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