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| 1. |
Two converging lenses are placed together with the focal lengths 15 cm and 30 cm respectively. Calculate the total power. |
| Answer» TION:F1 = 15CM, f2 = 30cmFocal length of COMBINATION, 1/f=1/f1+1/f21/f= 1/15+1/301/f= (15+30)/(15*30)f = 450/45f= 10cm4.0 | |