Two thin lenses of power +10D and -2D are placed in contact. The focal length of the combination is (a) +800 cm (b) +12.5 cm (c) +16.6 cm (d) +8 3 cm

Two thin lenses of power +10D and -2D are placed in contact. The focal

1.	Two thin lenses of power +10D and -2D are placed in contact. The focal length of the combination is (a) +800 cm (b) +12.5 cm (c) +16.6 cm (d) +8 3 cm
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Two thin lenses of power +10D and -2D are placed in contact. The focal length of the combination is (a) +800 cm (b) +12.5 cm (c) +16.6 cm (d) +8 3 cm​

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Two thin lenses of power +10D and -2D are placed in contact. The focal length of the combination is (a) +800 cm (b) +12.5 cm (c) +16.6 cm (d) +8 3 cm