(a) Suppose Willebrord Snell's near point of vision is 55cm from his unaided eye. What power, in Diopters, is needed to correct Willebrord's vision to the normal near point of 25cm if contact lenses are used? (b) If eyeglasses are used instead, and the distance from Willebrord's eye to the lens of the glasses is 2.1cm, what power in Diopters is needed for the glasses? (c) Willebrord also has difficulties focusing clearly on objects far away. If his unaided far point of vision is 3.52m, what power corrective lens (in glasses) would help his vision for very distant objects? (d) Describe a solution to his overall vision problem.
(a) Suppose Willebrord Snell's near point of vision is 55cm from his unaided eye. What power, in Diopters, is needed to correct Willebrord's vision to the normal near point of 25cm if contact lenses are used? (b) If eyeglasses are used instead, and the distance from Willebrord's eye to the lens of the glasses is 2.1cm, what power in Diopters is needed for the glasses? (c) Willebrord also has difficulties focusing clearly on objects far away. If his unaided far point of vision is 3.52m, what power corrective lens (in glasses) would help his vision for very distant objects? (d) Describe a solution to his overall vision problem.
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