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  2. Collimated beam - Wikipedia

    en.wikipedia.org/wiki/Collimated_beam

    Most amateur reflector telescopes need to be re-collimated every few years to maintain optimum performance. This can be done by simple visual methods such as looking down the optical assembly with no eyepiece to make sure the components are lined up, by using a Cheshire eyepiece, or with the assistance of a simple laser collimator or ...

  3. Collimator - Wikipedia

    en.wikipedia.org/wiki/Collimator

    Example of a particle collimator. A collimator is a device which narrows a beam of particles or waves. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction (i.e., make collimated light or parallel rays), or to cause the spatial cross section of the beam to become smaller (beam limiting device).

  4. Lensmeter - Wikipedia

    en.wikipedia.org/wiki/Lensmeter

    These videos are also available Wikiversity, Youtube and Archive.org. A Lensmeter in an Optical shop A simple lensmeter cross sectional view. 1 – Adjustable eyepiece 2 – Reticle 3 – Objective lens 4 – Keplerian telescope 5 – Lens holder 6 – Unknown lens 7 – Standard lens 8 – Illuminated target 9 – Light source 10 – Collimator

  5. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    Laser filters protect the operator against being dazzled/blinded by potential laser light sources. These filters are often an internal part in the assembly of lens elements. Scope cover , a semi-soft pouch that protects the sight from accidental collisions or the elements during transit and storage.

  6. Collimator sight - Wikipedia

    en.wikipedia.org/wiki/Collimator_sight

    M4 collimator sight on a M4 mortar. A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated aiming point aligned with the device the sight is attached to, regardless of eye position (with little parallax). [1] They are also referred to as collimating sights [2] or "occluded eye gunsight" (OEG). [3]

  7. Missed the 2025 Times Square ball drop? Watch the highlights here

    www.aol.com/watch-years-eve-2025-live-232407209.html

    If you missed the celebration, you can watch a replay of the live stream in the video player below. When and where to watch the ball drop in Times Square Viewing areas opened at 3 p.m. Tuesday.

  8. Acclaimed singer bludgeoned to death by daughter in her own ...

    www.aol.com/adult-daughter-bludgeons-mother...

    Police in Willingboro Township found Kim Beacham-Hanson, 57, dead from multiple blunt injuries allegedly delivered by her daughter, 32-year-old Breanna Beacham.

  9. Optical cavity - Wikipedia

    en.wikipedia.org/wiki/Optical_cavity

    Types of two-mirror optical cavities, with mirrors of various curvatures, showing the radiation pattern inside each cavity. Light confined in a resonator will reflect multiple times from the mirrors, and due to the effects of interference, only certain patterns and frequencies of radiation will be sustained by the resonator, with the others being suppressed by destructive interference.

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