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A convex lens of focal length 25 cm is placed coaxially in contact with a concave lens of focal length 20 cm. Determine the power of the combination. Will

the system be converging or diverging in nature?


It is -1 Power of a combination =P1+P2 P1 =power of convex lens = 4D P2=power of concave lens= -5D -5D+4D=-1D
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