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A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...
One of the earliest readers of microfilm was the Coddington Magnifier. Developed by Sir David Brewster, this magnifier was a "simple plano-convex lens of such thickness that the focus of its spherical curvature coincides with the flat surface of the lens. [2] On June 21, 1859, the first patent for a microfilm was issued to Rene Dargon in France.
Grandma's Reading Glass is a 1900 British silent trick film, directed by George Albert Smith, featuring a young boy who borrows a huge magnifying glass to focus on various objects. The film was shot to demonstrate the new technique of close-up .
Reading stone in Archeon, a historical theme park. A reading stone is an approximately hemispherical lens that can be placed on top of text to magnify the letters so that people with presbyopia can read it more easily. Reading stones were among the earliest common uses of lenses.
Vertometer which is used to determine refractive power of lenses such as glasses, contact lenses and magnifier lens; DNA sequencers can be considered optical instruments, as they analyse the color and intensity of the light emitted by a fluorochrome attached to a specific nucleotide of a DNA strand.
Thus, while a "full page magnifier" based on a fresnel lens can span some 625 cm 2 (96.9 sq in) , it typically achieves no more than 1.4x magnification (advertised as "2x" if measured by area instead of the scale factor); an aspheric segment hand magnifier can achieve a scale factor in excess of two (area factor in excess of four) but typically ...
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