Question about Optics
The direction of light can be changed in 2 ways. One way is refraction which is usually done by a lens (eyeglasses do this). The other is reflection, most often done by a mirror. Telescopes are almost always based on reflection and/or refraction designs. A reflective telescope has at least one curved mirror, often 2 curved mirrors which focus light by reflecting a larger area of natural light on a smaller spot.
Posted on Dec 07, 2014
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Posted on Jan 02, 2017
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