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two lens of power plus 2D and -1.5 de are placed in contact with each other what is focal length of the combination and the nature of this lens combination

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two lens of power plus 2D and -1.5 de are placed in contact with each other what is focal length of the combination and the nature of this lens combination​

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two lens of power plus 2D and -1.5 de are placed in contact with each other what is focal length of the combination and the nature of this lens combination