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two lenses of power +2.50 D and -3.75 D are combined to form a compound lens. Its focal length in cm will be- (1) 40 (2) -40 (3) -80 (4) 160 |
| Answer» two lenses of power +2.50 D and -3.75 D are combined to form a compound lens. Its focal length in cm will be- (1) 40 (2) -40 (3) -80 (4) 160 | |