a convex lens of focal length 25cm and a concave lens of focal length 10 cm are placed in close contact with each other. calculate the lens power of this combination
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Lens power the combination is minus 6. Power = 1/f (f in meters) or P=100/f (f in cms). Power convex = +4 and Power of concace lens = -10. Adding the two powers gives the power of combined lens
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