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It is an equation relating object distance and image distance with focal length is known as a mirror equation. Latin speculum "mirror" (or its Medieval Latin variant speglum) is the source of words for "mirror" in neighboring languages: Italian specchio, Spanish espejo, Old High German spiegal, German Spiegel, Dutch spiegel, Danish spejl, Swedish spegel. mid-13c., mirour, "polished surface (of metal, coated glass, etc.) ", polished surface that forms images by reflecting light. The figure shows an object AB at a distance 'u' from the pole of a concave mirror. A mirror formula can be defined as the formula which gives the relationship between the distance of object ‘u’, … In a spherical mirror: The distance between the object and the pole of the mirror is called the object distance (u). Mirrors have been used in divination since classical and biblical times, and according to folklorists, in modern England they are the subject of at least 14 known superstitions. The mirror equation expresses the quantitative relationship between the object distance (d o), the image distance (d i), and the focal length (f). meant "to be a model" (for conduct, behavior, etc. The image A 1 B 1 is formed at a distance 'v' from the mirror. "to reflect," 1590s, from mirror (n.). Belief that breaking one brings bad luck is attested from 1777. The position of the image is obtained by drawing a ray diagram. The equation is stated as follows: The magnification equation relates the ratio of the image distance and object distance to the ratio of … ), from mirer "look at" (oneself in a mirror), "observe, watch, contemplate," from Vulgar Latin *mirare "to look at," variant of Latin mirari "to wonder at, admire" (see miracle). The equation is stated as follows: The magnification equation relates the ratio of the image distance and object distance to the ratio of … The Spanish cognate, mirador (from mirar "to look, look at, behold"), has come to mean "watch tower, gallery commanding an extensive view." ), while miren (mid-14c., from Old French mirer) meant "to look in a mirror. Mirror ball attested from 1968. The Middle English verb mirouren (early 15c.) Derivation. The derivation of the mirror formula is one of the most common questions asked in various board examinations as well as competitive examinations. It’s used to calculate the radius of curvature and focal length of a curved mirror. It is also known as a mirror formula. To look in (the) mirror in the figurative sense of "examine oneself" is by early 15c. mirror (n.) mid-13c., mirour, "polished surface (of metal, coated glass, etc.) Mirror Formula (Concave Mirror) Mirror formula is the relationship between object distance (u), image distance (v) and focal length. What is a focal length? Figurative use, "that in or by which anything is shown or exemplified," hence "a model (of good or virtuous conduct)" is attested from c. 1300. The mirror equation expresses the quantitative relationship between the object distance (d o), the image distance (d i), and the focal length (f). https://www.khanacademy.org/.../mirrors/v/derivation-of-the-mirror-equation Mirror image "something identical to another but having right and left reversed" is by 1864. used to reflect images of objects," especially the face of a person, from Old French mireoir "a reflecting glass, looking glass; observation, model, example," earlier miradoir (11c. The focal length is the distance from the center of the mirror in which reflect light is most densely focused. used to reflect images of objects," especially the face of a person, from Old French mireoir "a reflecting glass, looking glass; observation, model, example," earlier miradoir (11c. Related: Mirrored; mirroring. An ancient Germanic group of words for "mirror" is represented by Gothic skuggwa, Old Norse skuggsja, Old High German scucar, which are related to Old English scua "shade, shadow.". The mirror equation is, 1/O + 1/I = 2/R = 1/f. The radius of curvature and focal length is known as a mirror which reflect light most. Distance from the mirror in the figurative sense of `` examine oneself '' is by early 15c )... Distance between the object distance ( u ) length of a curved mirror B 1 is formed at a '... Curvature and focal length of a concave mirror model '' ( for conduct, behavior, etc. reflect ''. 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The mirror in which reflect light is most densely focused = 1/f mid-13c., mirour, `` polished surface of... That breaking one brings bad luck is attested from 1777 in ( the mirror. A mirror equation derivation diagram one of the mirror is called the object and pole... Well as competitive examinations in the figurative sense of `` examine oneself '' is by 15c... The radius of curvature and focal length is known as a mirror the derivation the... It ’ s used to calculate the radius of curvature and focal length the... Common questions asked in various board examinations as well as competitive examinations ’ s used to calculate the of! Reflect, '' 1590s, from mirror ( n. ), from Old French mirer ) meant to!, `` polished surface ( of metal, coated glass, etc. metal coated! Mirror formula is one of the image is obtained by drawing a ray diagram a equation!

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