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Multifocal contact lenses (e.g. bifocals or progressives) are comparable to spectacles with bifocals or progressive lenses because they have multiple focal points. Multifocal contact lenses are typically designed for constant viewing through the center of the lens, but some designs do incorporate a shift in lens position to view through the ...
A Luneburg lens converts a point source into a collimated beam when the source is placed at its edge.. Each point on the surface of an ideal Luneburg lens is the focal point for parallel radiation incident on the opposite side.
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 ...
A collection of telephoto lenses. A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length.
Snapchat is an American multimedia instant messaging app and service developed by Snap Inc., originally Snapchat Inc.One of the principal features of Snapchat is that pictures and messages are usually only available for a short time before they become inaccessible to their recipients.
A new investigation by Consumer Reports has found that 12 brands of cinnamon powder and multi-spice blends contained high levels of lead.
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1717 Olentangy River Road, Columbus, Ohio · Directions · +1 614-405-7899