A person uses eyeglasses that have a focal length f = -25 cm and are mounted 1.5

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A person uses eyeglasses that have a focal length f  = -25 cm and are mounted 1.5 cm in front of his eyes to look at objects that are very far away.
(a) If he switches to contact lenses that are mounted in contact with the eye, what focal length should the contact lenses have?
(b) Make a qualitative sketch of the shape of the lenses. Are both lens surfaces concave, convex, or?

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