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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. 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