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What are primary focus and secondary focus of convex lens? |
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Answer» Solution :Primary focus: The primary focus `F_(1)` is defined as a POINT where an OBJECT should be placed to give parallelemergent RAYS to the principal axis. Secondary focus: The secondary focus `F_(2)` is defined as a point where all the parallelrays travelling close to the principal axis converge to form an IMAGE on theprincial axis. |
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