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Measurement of Focal Length of lenses
Member rating: No Rating | Words: | Submitted: Wed May 10 2006
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Measurement of Focal Length of lenses Objective : - To study the image formed by a convex lens - To determine the focal length of a convex lens by graphic method Apparatus : Ray box 1 Convex lens with holder 1 Concave lens with holder 1 Metre rule 1 Object slide (A piece of transparent ruler) 1 White screen 1 12 V d.c. power supply 1 Theory : Lenses are made of glass or of similar transparent material, which refracts light at the surfaces. They are shaped so that they diverge or converge a bundle of parallel rays. When a bundle of parallel light rays enters a converging lens, the rays are focused at a point in space a distance f, the focal length, from the lens. A converging lens can be used to form an image on a screen of an object. The lens formula relates the focal length f of a lens, the object distance u and the image distance v. The formula can be used for both converging and...
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