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Lenses

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Rohan Desai

on 24 November 2009

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Transcript of Lenses

Lenses are used in loads of things:
Cameras
Telescopes
Microscopes This is going to be about: TELESCOPES .The objective lens (in refractors) or primary mirror (in reflectors) collects lots of light from a distant object and brings that light, or image, to a point or focus. Telescopes are amazing devises, they make things from furthur away seem a lot closer. There are two types of telescopes, the refractor which uses glass and the reflector telescope which uses mirrors An eyepiece lens takes the bright light from the focus of the objective lens or primary mirror and "spreads it out" (magnifies it) to take up a large portion of the retina. This is the same principle that a magnifying glass (lens) uses; it takes a small image on the paper and spreads it out over the retina of your eye so that it looks big. Lenses The END
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