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Recent questions tagged focal

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Why do we use refracting telescope with large objective lens of large focal length?
asked Oct 22, 2017 in Physics by sonia (36.5k points)
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How does the thickness of lens affect its focal length?
asked Oct 22, 2017 in Physics by sonia (36.5k points)
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How does the thickness of lens affect its focal length?
asked Oct 19, 2017 in Physics by shamroz (41.5k points)
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Define the following terms applied to a lens
asked Oct 18, 2017 in Physics by sonia (36.5k points)
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A coin is placed at the focal point of a converging lens.
asked Oct 18, 2017 in Physics by sonia (36.5k points)
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How are focal length and radius of curvature related to each other?
asked Oct 18, 2017 in Physics by shamroz (41.5k points)
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Define the following terms:
asked Oct 17, 2017 in Physics by shamroz (41.5k points)
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