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Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
Toric lens surface as "cap" (top-right) from a torus (here with R = 1.2 r ). A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical.
Barlow lens. The Barlow lens, named after Peter Barlow, is a diverging lens which, used in series with other optics in an optical system, increases the effective focal length of an optical system as perceived by all components that are after it in the system. The practical result is that inserting a Barlow lens magnifies the image.
Syndicate (s) King Features Syndicate. Genre (s) Humor, Professions, Family. Pros & Cons is a comic strip about a lawyer, a psychiatrist and a police officer created by Glasgow –based artist Kieran Meehan. It was known as A Lawyer, A Doctor & A Cop before July 7, 2008, when it was renamed in an effort to make the title easier to remember.
Michael Kamen. Roger Waters singles chronology. " The Pros and Cons of Hitch Hiking ". (1984) "Every Stranger's Eyes". (1984) Music video. "The Pros and Cons of Hitch Hiking" on YouTube. " The Pros and Cons of Hitch Hiking ", is a song written and performed by Roger Waters from his debut studio album, The Pros and Cons of Hitch Hiking.
Eyeglass prescription. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient. If an eye examination indicates that corrective lenses are appropriate, the ...