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converging lens
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double convex lens common lenses
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converging lens

optics

Learn about this topic in these articles:

focal point

  • How lenses and mirrors affect light and vision
    In lens: Optical principles for lenses

    …rays can be caused to converge on, or to appear to diverge from, a single point. This point is called the focal point, or principal focus, of the lens (often depicted in ray diagrams as F). Refraction of the rays of light reflected from or emitted by an object causes…

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