One lens of a nearsighted persons eyeglasses has a focal, Physics

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One lens of a nearsighted persons eyeglasses has a focal

One lens of a nearsighted person's eyeglasses has a focal length of -21.7 cm, and the lens is 1.70 cm from the eye. If the person switches to contact lenses that are placed directly on the eye, what should be the focal length of the corresponding contact lens?

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