a convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other the power of this combination is
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(a) The power of the combination of lenses is the algebraic sum of the powers of the individual lenses. ⇒ P = 4 - 10 = - 6 D. (b) Suppose, the focal length of the combination of the lenses is f. Therefore, the focal length of the combination of the lenses is - 16.7 cm.
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