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Two lenses of power +3 and -1 dioptres are placed in contact. The focal length of the combined lens is (a) 100 cm (b)

Two lenses of power +3 and -1 dioptres are placed in contact. The focal length of the combined lens is (a) 100 cm (b) 25 cm (c) 50 cm (d) 30.3 cm

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