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Physics
Classical Physics
Optics
Focus or parallelize the light from an LED
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[QUOTE="sophiecentaur, post: 6360170, member: 199289"] A compound arrangement with two lenses could do what you want without needing a single large diameter, lens. eBay has a selection of many different second hand SLR camera lenses you could play with and the cheapest lenses are only a few quid each. (Even the lowest spec lenses are actually pretty good.) I do appreciate that you are not planning on building a whole Optics lab but you could find it interesting and get a result. Do some sketches , using the dreaded 1/f = 1/u + 1/v formula. The first lens will form one virtual image behind the LED and the second lens could focus that intermediate image to a point where you want it. There are a host of possible solutions, depending on the lenses you can get hold of. [/QUOTE]
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Forums
Physics
Classical Physics
Optics
Focus or parallelize the light from an LED
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