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Two thin lenses of power +6D and – 2D are in contact. What is the focal length of the combination?

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Two thin lenses of power +6D and – 2D are in contact. What is the focal length of the combination?

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Net power of lens combination P = +6D - 2D = + 4D 

∴ Focal length, F = 1/P = 1/4 m = 25cm

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