fixed mirror
71Reflecting instrument — Reflecting instruments are those that use mirrors to enhance their ability to make measurements. In particular, the use of mirrors permits one to observe two objects simultaneously while measuring the angular distance between the objects. While… …
72French literature — Introduction the body of written works in the French language produced within the geographic and political boundaries of France. The French language was one of the five major Romance languages to develop from Vulgar Latin as a result of the …
73Alhazen — For the Moon crater, see Alhazen (crater). For the asteroid, see 59239 Alhazen. Alhazen Alhazen (Ibn al Haytham) …
74Vilayanur S. Ramachandran — Infobox Scientist name = Vilayanur S. Ramachandran caption = Dr. V. S. Ramachandran birth place = Tamil Nadu, India death date = death place = residence = San Diego, California nationality = field = Neurology work institution = University of… …
75Twin-lens reflex camera — A twin lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective (the lens that takes the picture), while the other is used for the waist level viewfinder… …
76microscope — /muy kreuh skohp /, n. 1. an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye. 2. (cap.) Astron. the… …
77spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
78Optical landing system — The Fresnel Lens Optical Landing System of Charles de Gaulle An optical landing system (OLS) (nicknamed meatball or simply, Ball ) is used to give glidepath information to pilots in the terminal phase of landing on an aircraft carrier.[1] From… …
79Heliograph — A Heliograph (from the Greek helios (Lang el| Ἥλιος), meaning sun , and (γραφειν) = write) is a wireless solar telegraph that signals using Morse code flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the …
80Christianity — /kris chee an i tee/, n., pl. Christianities. 1. the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches. 2. Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; …
