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InterviewSolution
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Principal Focus and Focal Length o |
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Answer» Principal focus is a point (on the principal axis) where parallel incident rays meet after reflecting (in mirrors) or refracting (in lenses). It is a fixed point of particular lens/mirror and depends upon its shape. Principal Focus also determines the focal length of the lens/mirror. Focal lengthThe distance between the centre of a lens or curved mirror and its focus, is called focal length. It measures of how strongly the system converges or diverges light. |
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