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  2. Objective (optics) - Wikipedia

    en.wikipedia.org/wiki/Objective_(optics)

    Several objective lenses on a microscope. Objective lenses of binoculars. In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.

  3. Optical microscope - Wikipedia

    en.wikipedia.org/wiki/Optical_microscope

    A compound microscope uses a lens close to the object being viewed to collect light (called the objective lens), which focuses a real image of the object inside the microscope (image 1). That image is then magnified by a second lens or group of lenses (called the eyepiece ) that gives the viewer an enlarged inverted virtual image of the object ...

  4. Oil immersion - Wikipedia

    en.wikipedia.org/wiki/Oil_immersion

    Oil immersion objective lenses look superficially identical to non-oil immersion lenses. In light microscopy, oil immersion is a technique used to increase the resolving power of a microscope. This is achieved by immersing both the objective lens and the specimen in a transparent oil of high refractive index, thereby increasing the numerical ...

  5. Condenser (optics) - Wikipedia

    en.wikipedia.org/wiki/Condenser_(optics)

    As with objective lenses, a condenser lens with a maximum numerical aperture of greater than 0.95 is designed to be used under oil immersion (or, more rarely, under water immersion), with a layer of immersion oil placed in contact with both the slide/coverslip and the lens of the condenser. An oil immersion condenser may typically have NA of up ...

  6. Stereo microscope - Wikipedia

    en.wikipedia.org/wiki/Stereo_microscope

    A - Objective B - Galilean telescopes (rotating objectives) C - Zoom control D - Internal objective E - Prism F - Relay lens G - Reticle H - Eyepiece The stereo , stereoscopic or dissecting microscope is an optical microscope variant designed for low magnification observation of a sample, typically using light reflected from the surface of an ...

  7. Point spread function - Wikipedia

    en.wikipedia.org/wiki/Point_spread_function

    By virtue of the linearity property of optical non-coherent imaging systems, i.e., . Image(Object 1 + Object 2) = Image(Object 1) + Image(Object 2). the image of an object in a microscope or telescope as a non-coherent imaging system can be computed by expressing the object-plane field as a weighted sum of 2D impulse functions, and then expressing the image plane field as a weighted sum of the ...

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