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Principal Focus and Focal Length of a Concave Mirror |
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Answer» Principal focusof aconcave mirroris apointwhere light rays parallel toprinciple axisconverge. Thedistancebetween pole ofmirrortopointofprinciple focusisfocal lengthofmirror.Focal lengthofspherical mirroris half of its radius of curvature. |
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