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An extended hemispherical lens is a special type of plano-convex lens, in which the lens's curved surface is a full hemisphere and the lens is much thicker than the radius of curvature. Another extreme case of a thick convex lens is a ball lens, whose shape is completely round. When used in novelty photography it is often called a "lensball".
A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses: the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement. They usually provide between 1.8× and 6× magnification.
Plano-convex may refer to: Plano-convex lens, in optics; Plano-convex, a type of mudbrick used by the ancient Sumerians This page was last edited on 20 ...
Their name comes from the distinctive ridged Fresnel lens used on the front. Profile spots (UK) or ellipsoidal reflector spotlights (US) tend to be longer fixtures containing convex lenses and having a gate at their focal point which enables the insertion of gobos or irises to shape the beam of light. They give a hard-edged beam most often ...
The Plano-Convex lenses, named for having one flat side and one convex (bowed out) side, have their convex sides facing each other within the tube. The distance between these lenses and the distance between them and the reflector determines how wide the output beam of light is; A set of brackets on the end of the lens tube for the insertion of ...
This condenser is composed of two lenses, a plano-convex lens somewhat larger than a hemisphere and a large bi-convex lens serving as a collecting lens to the first. The focus of the first lens is traditionally about 2mm away from the plane face coinciding with the sample plane.
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