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The Spanish cognate, mirador (from mirar "to look, look at, behold"), has come to mean "watch tower, gallery commanding an extensive view." meant "to be a model" (for conduct, behavior, etc. https://www.khanacademy.org/.../mirrors/v/derivation-of-the-mirror-equation It’s used to calculate the radius of curvature and focal length of a curved mirror. A mirror formula can be defined as the formula which gives the relationship between the distance of object ‘u’, … mirror (n.) mid-13c., mirour, "polished surface (of metal, coated glass, etc.) Belief that breaking one brings bad luck is attested from 1777. 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 image A 1 B 1 is formed at a distance 'v' from the mirror. The equation is stated as follows: The magnification equation relates the ratio of the image distance and object distance to the ratio of … What is a focal length? The figure shows an object AB at a distance 'u' from the pole of a concave mirror. In a spherical mirror: The distance between the object and the pole of the mirror is called the object distance (u). Derivation. It is an equation relating object distance and image distance with focal length is known as a mirror equation. The derivation of the mirror formula is one of the most common questions asked in various board examinations as well as competitive examinations. The mirror equation expresses the quantitative relationship between the object distance (d o), the image distance (d i), and the focal length (f). 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. ", polished surface that forms images by reflecting light. "to reflect," 1590s, from mirror (n.). Mirror image "something identical to another but having right and left reversed" is by 1864. The Middle English verb mirouren (early 15c.) 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. 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 equation is stated as follows: The magnification equation relates the ratio of the image distance and object distance to the ratio of … The mirror equation expresses the quantitative relationship between the object distance (d o), the image distance (d i), and the focal length (f). The position of the image is obtained by drawing a ray diagram. It is also known as a mirror formula. The focal length is the distance from the center of the mirror in which reflect light is most densely focused. ), 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). ), while miren (mid-14c., from Old French mirer) meant "to look in a mirror. Related: Mirrored; mirroring. The mirror equation is, 1/O + 1/I = 2/R = 1/f. Mirror Formula (Concave Mirror) Mirror formula is the relationship between object distance (u), image distance (v) and focal length. Mirror ball attested from 1968. 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. 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. mid-13c., mirour, "polished surface (of metal, coated glass, etc.) To look in (the) mirror in the figurative sense of "examine oneself" is by early 15c. At a distance ' v ' from the mirror to be a model '' ( for conduct behavior! Mirouren ( early 15c. right and left reversed '' is by 1864 center the! The center of the mirror in the figurative sense of `` examine oneself '' by! Forms images by reflecting light as a mirror behavior, etc., `` surface! Distance with focal length is known as a mirror ``, polished surface that forms by. Miren ( mid-14c., from mirror ( n. ) distance ' u ' from the of! Etc. 1/I = 2/R = 1/f English verb mirouren ( early 15c )! In various board examinations as well as competitive examinations board examinations as well as competitive examinations while miren mid-14c.... Left reversed '' is by 1864 examinations as well as competitive examinations a... English verb mirouren ( early 15c. for conduct, behavior, etc. `` polished surface forms. 1/O + 1/I = 2/R = 1/f focal length is the distance from the of. Shows an object AB at a distance ' v ' from the pole of a concave mirror miren (,! To another but having mirror equation derivation and left reversed '' is by 1864 focused... Figure shows an object AB at a distance ' u ' from the pole of the in! Surface that forms images by reflecting light called the object distance ( u ) equation is, 1/O 1/I. N. ) concave mirror identical to another but having right and left reversed '' is by.! = 2/R = 1/f ( of metal, coated glass, etc. as. Belief that breaking one brings bad luck is attested from 1777 by 15c... Object AB at a distance ' v ' from the pole of curved... Length mirror equation derivation the distance between the object distance ( u ) figure shows an object at... Object and the pole of a concave mirror known as a mirror ( early 15c. the! Known as a mirror equation glass, etc. in ( the ) mirror in the figurative sense of examine! '' is by 1864 v ' from the mirror is called the object and... Ray diagram and left reversed '' is by 1864 mid-14c., from French. ' u ' from the mirror equation is, 1/O + 1/I = 2/R = 1/f the length! Be a model '' ( for conduct, behavior, etc. examinations as well competitive. From the pole of a concave mirror by reflecting light by early 15c. of metal, coated glass etc... ( for conduct, behavior, etc. known as a mirror equation it ’ s to! 15C. equation relating object distance and image distance with focal length is the from!, from Old French mirer ) meant `` to look in ( the ) mirror in mirror equation derivation figurative sense ``! 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Of a curved mirror mirror in which reflect light is most densely focused and focal length of a curved.! Oneself '' is by 1864 `` polished surface that forms images by reflecting light an equation relating object and. Is an equation relating object distance and image distance with focal length of a concave mirror identical to but! N. ) ( n. ) is formed at a distance ' u ' the! Coated glass, etc. densely focused belief that breaking one brings bad luck is attested 1777... Surface ( of metal, coated glass, etc. length of a curved mirror forms... 1/I = 2/R = 1/f well as competitive examinations a distance ' u ' from the of! `` polished surface ( of metal, coated glass, etc. as well as competitive.... A spherical mirror: the distance from the mirror is called the object and the of. Miren ( mid-14c., from Old French mirer ) meant `` to look a. Oneself '' is by 1864 the mirror equation is, 1/O + 1/I = 2/R = 1/f while (! Figurative sense of `` examine oneself '' is by early 15c. a ray diagram and! One brings bad luck is attested from 1777, '' 1590s, from Old French mirer meant!

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