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A CONVEXLENS OF FOCAL LENGH 30 CM IS INCONTACT WITH A CONCAVE LENS OF FOCAL LENGH 40 CM.THE LENGH OF COMBINATION IS \lbrack IGNORE THE THICKNESS OF LENS |
| Answer» A CONVEXLENS OF FOCAL LENGH 30 CM IS INCONTACT WITH A CONCAVE LENS OF FOCAL LENGH 40 CM.THE LENGH OF COMBINATION IS \lbrack IGNORE THE THICKNESS OF LENS | |