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Example 53 An equiconvex lens of focal length 15 cm is cut into two equal...

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Example 53 An equiconvex lens of focal length 15 cm is cut into two equal halves as shown in Fig 9 72 What is the focal length of each half CBSE Sample Paper 98 Solution For the equiconvex lens let R R R R Then from lens maker s formula 1 12 1 1 R 1 f For each half lens R R R 00 7 7 4 1 12 13 1 201 1 f R f 1 f 2 x 15 30 cm Dividing i by ii we get 2 u 1 isol R 1 1 R 2 1 Fig 9 72 i ve why ii

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