Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at

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Ram Sharma

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Q. Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at

(A) 10 cm
(B) 20 cm
(C) 40 cm
(D) infinity

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✅ Correct Answer: (C) 40 cm

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