1. Consider a farsighted person whose range of vision is from 125 cm to very far from the eye. a) What type of lens and what focal length is needed for eyeglasses to correct the vision? b) Draw a ray diagram and locate the image for the lens in part (a) with the object at 30 cm from the lens. c) What type of lens and what focal length is needed for contact lens to correct the vision? d) Suppose the focal length for contact lens were used to make the eyeglasses as a mistake, what is the closest object the person could see with these wrong eyeglasses?
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They need eyeglasses to correct their vision. The type of lens needed is a convex lens. Show more…
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A farsighted eye is corrected by placing a converging lens in front of the eye. The lens will create a virtual image that is located at the near point (the closest an object can be and still be in focus) of the viewer when the object is held at a comfortable distance, usually taken to be 25.0 cm. If a person has a near point of 53.5 cm, what power reading glasses should be prescribed to treat this hyperopia? Assume that the distance from the eye to the lens is negligible. power: diopters
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