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Amazing curves of glass or plastic called lenses make all these things possible. Let's take a closer look at what they are and how they work! ... How do lenses work? ... Read how they work in our article on Fresnel lenses...
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www.explainthatstuff.com/lenses.html
www.explainthatstuff.com/lenses.html
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In addition, lenses can be made to correct for double vision when the eyes do not work together ("crossed eyes"). The lenses do this by moving the image to match the wayward eye. ... Introduction to How Corrective Lenses Work...
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www.howstuffworks.com/lens2.htm
www.howstuffworks.com/lens2.htm
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Plus and minus lenses can be combined, with the total lens type being the algebraic sum of the two. For example, a +2.00D lens added to a -5.00D lens yields ... Introduction to How Corrective Lenses Work ... How Sunglasses Work...
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www.howstuffworks.com/lens4.htm
www.howstuffworks.com/lens4.htm
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Brief and Straightforward Guide: How Do Zoom Lenses Work on Cameras? ... Optical zoom lenses are far superior to digital zoom lenses. A camera with an optical zoom feature is much like any conventional camera. The lens is like a telescope that magnifies your subject and then captures the enlarged image.
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www.wisegeek.com/how-do-zoom-lenses-work-on-cameras.htm
www.wisegeek.com/how-do-zoom-lenses-work-on-cameras.htm
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Sometimes the different parts of the eye don't work together the way they should. When this happens, people wear glasses or contact lenses. Find out more in this article for kids. ... Glasses or contact lenses work so well because they can correct refractive problems. In other words, they bend the light rays in a way that...
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kidshealth.org/kid/stay_healthy/body/glasses.html
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Ever wondered what's going on inside lenses that are all "we optically stabilize yer blurry images, biyatch" and make you pay extra? A lot of movin' and groovin', as this Canon lens cutaway reveals.
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gizmodo.com/5163783/how-optical-image-stabilization-len...
gizmodo.com/5163783/how-optical-image-stabilization-lenses-work-jiggle-jiggle
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Although nearly 36 million Americans wear contact lenses, not everyone wears them to correct vision problems [ref]. Celebrities use contact lenses to change the color of their eyes, athletes put them on to give them extra-sharp vision on the field, ... Introduction to How Contact Lenses Work ... How Corrective Lenses Work...
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health.howstuffworks.com/contact-lens.htm
health.howstuffworks.com/contact-lens.htm
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There are a few things that you need to know about lenses in order to understand and to use them. We will only use concave lenses because those are the one that allow you to create an image. First we'll discuss the parts of a lens. Here is ...
http://users.telenet.be/cool_things_with_fresnel_lenses...
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Since we depend so much on the lenses inside those frames to improve our view of the world, you might wonder just what goes into creating them. ... Introduction to How Corrective Lenses Work ... How Sunglasses Work...
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science.howstuffworks.com/lens.htm
science.howstuffworks.com/lens.htm
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