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[" 112A convex lens of focal length 40"c...

[" 112A convex lens of focal length 40"cm" is an contact with a concave lens of focal length "25],[cm" .The power of combination is "],[[" (a) "-1.5D," (b) "-6.5D],[" (c) "+6.5D," (d) "+6.57D]]

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