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Converging and diverging lenses, characterizing lenses, adding lenses, real images, virtual images

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PH 122
Brian Jones

28 April Lenses & Images A lens or mirror can bend rays of light to make an image. There are two different kinds of lenses: converging and diverging. Mirrors follow the same rules. There are two different kinds of images: real and virtual. Optical devices that you look through use virtual images; those that project images use real images. Converging & Diverging Lenses Converging lens f (focal length) is + Parallel rays are converged at the focal point, beyond the lens Rays continue after passing through the focal point. Diverging lens f is – Focal point is in front of the lens Rays appear to diverge from the focal point. Characterizing Lenses Refractive power P = 1/f Unit for refractive power is the diopter -1 1 D = 1 m What is the power of a converging lens with focal length 20 cm? 1/0.2 m = 5 diopters What is the power of a diverging lens of focal length -20 cm? -5 diopters Adding Lenses For two lenses in close proximity, P total P 1 P 2 A converging lens has a focal length of 10 cm is plac
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