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                                    771If the magnitude of dispersive powers of two lensesare 0.024 and 0.036. Then their focal lengths willbe for aberration free combination.(1) 30 cm, -40 cm(2) 30 cm, 45 cm(3) 10 cm, 30 cm(4) 20 cm, 35 cm | 
                            
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Answer»  Bro the answer is option 3  | 
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