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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 oi lenses.

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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 oi lenses. The power in diopters of the combination is

(a) zero

(b) 25

(c) 50

(d) infinite

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1 Answer

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Best answer

Correct option (a) zero 

Explanation:

Focal length of convex lens f1 =25 cm Focal length of concave lens f2 = - 25 cm Power of combination in dioptres.

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