¿Qué es una lente?

viernes, 31 de agosto de 2007



Una lente es un medio u objeto que concentra o dispersa rayos de luz.

Las lentes más comunes se basan en el distinto grado de refracción que experimentan los rayos de luz al incidir en puntos diferentes de la lente. Entre ellas están las utilizadas para corregir los problemas de visión en gafas, anteojos o lentillas. También se usan lentes, o combinaciones de lentes y espejos, en telescopios y microscopios. El primer telescopio astronómico fue construido por Galileo Galilei usando dos lentes convergentes.

Existen también instrumentos capaces de hacer convergir o divergir otros tipos de ondas electromagnéticas y a los que se les denomina también lentes. Por ejemplo, en los microscopios electrónicos las lentes son de carácter magnético. En astrofísica es posible observar fenómenos de lentes gravitatorias cuando la luz procedente de objetos muy lejanos pasa cerca de objetos masivos, curvándose en su trayectoria.

Link: http://es.wikipedia.org/wiki/Lente

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There are likely difficulties with the enterprise item. For case in position, a powerful offer could rapidly swamp a tiny business with way too many buyers, risking a chance that customers will be dissatisfied, or that there will not be enough product to meet up with the want. Gap, a large garments retailer, was able to control 445,000 discount codes in a countrywide offer (although it experienced server issues at a single level), but a more compact company could switch out to be out of the blue flooded with consumers. A single espresso store in Portland, Oregon struggled with an enhance in customers for a handful of months, when it promoted shut to 1,000 Groupons on the 1 working day it was introduced, in accordance to one particular specific report. In reaction to relevant troubles, Groupon officers point out that 'deal' subscriptions need to be capped in progress to a sensible quantity.

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