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A concave lens of focal length 40 cm and a concave lens of 50 cm are placed in contact find the focal length of the combination |
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Answer» -22.23 Explanation: f1=-40cm f2=-50cm 1/ F= -1/f1-1/f2 -1/40-1/50 =-9/200 F=-200/9=-22.23 |
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