what is focul lenght?
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The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus.
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focal length is the distance between the centre of a convex lens or a concave mirror and the focal point of the lens or mirror - the point where parallel rays of light meets or Converse is called focal length .
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