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                                    What is the power of the convex lens having focal length 40 cm ?  | 
                            
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Answer»  A convex LENS of focal LENGTH 40 CM is in contact with a concave lens of focal length 25 cm. The power of the combination is. Solution : P=1f=1f1+1f2=10.4+1-0.25=-1.5diopter.  | 
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