Convex lens

by Y Kaymak · 2017 · Cited by 59 — We compare narrow and wide laser beams in a free-space optical (FSO) communications system for high-speed train communications and analyze ...

CrystalBall

PRESS/VAC, VENT. SPRING 12″ HG VACUUM FORTVALE. $1.00. SPRING 12" HG VACUUM FORTVALE quantity. Add to Cart. SKU: 5104874 Categories: PRESS/VAC, ...

Ball lenses are used in endoscopy, bar code readers. Lenses are made of single piece of glass  and can focus or collimate light, depending upon the geometry of the input source. Ball lenses are rarely used for imaging, so that the relevant optical characterization revolves about determination of focal lenght. Given a ball lens with diameter D, made from glass with index nL, operated in air, the effective focal length, measured from the center of the lens, is easily found from (1). Since ball lenses are very "thick" lenses, the difference between EFL and BFL is significant and can be calculated from (2). The numerical aperture depends on the aperture employed.

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It describes smoothing and sharpening techniques of spatial filtering with linear and non linear functions WIT00 HRead less

Opticallenses

Confocal microscopy minimizes the amount of background fluorescence collected from the out-of-focus region of a sample by forcing emissions from fluorophores ...

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Lens

Mar 21, 2014 — I have a bog standard antique 'machine light' right at the spindle but nothing beats good general lighting around the whole work area.

Today's optical-quality polymer lenses outperform even the finest of traditional glass Fresnel lenses.

Define diffraction grating. diffraction grating synonyms, diffraction grating pronunciation, diffraction grating translation, English dictionary definition ...

Depth of Field (DoF) refers to the distance between the closest and farthest objects that appears acceptably sharp in a photograph.

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So, it turns out, what you have to do is to put in a filter oriented at 45 degrees to the first one, and it should be a quarter of a wavelength ...