why we use minimum two rays in case of refraction
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To construct a ray diagram, we use two light rays which are so chosen To construct a ray diagram, we use two light rays which are so chosen that it is easy to know their directions after reflection from the lens. ... Use these two rays to locate the image of an object placed between 'F' and '2F' of a convex lens.
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Refraction happens because the speed of the wave changes. Light travels slower (compared to its speed in air)
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