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A convex lens and a concave lens, each having same focal length of 25 cm,

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A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power of the combination (in diopter) is

(a) zero 

(b) 25 

(c) 50 

(d) infinite

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Correct answer is (a) zero

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