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FACULTAD DE BIOLOGIA
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vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvAcomodación

Al diseñar una cámara fotográfica el poder y la posición de la lente deben calcularse de forma que losrayos paralelos de luz que incidan sobre ella enfoquen exactamente sobre la película fotográfica. Sin embargo, si el objeto se acerca a la cámara, los rayos de luz que salen de este ya no son paralelossino divergentes, por lo que la lente objetivo, cuyo poder de refracción es fijo, ya no puede enfocarlos a la misma distancia sino detrás de la película fotográfica, tanto más lejos de ella cuanto máscerca esté el objeto por fotografiar. El sistema está entonces desenfocado. En este caso, basta con alejar la lente de la película fotográfica la distancia necesaria para que el foco caiga nuevamentesobre la película. El sistema está nuevamente enfocado. En las cámaras fotográficas esto se logra mediante un sistema de enfoque que permite alejar la lente de la película.

En el ojo, el...