you are given that the diameter of a ball is about 2.3 cm and a normal eye can adjust the focal length of its eye lens to see object situated anywhere from 25 cm to an infinite distance away from it .what is the power of the normal eye lens when ciliary muscle are fully relaxed?
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when the ciliary muscle fully relaxed then the focal length curvature is decrease and increase in focal length of lens so the lens become thin. this enable us to see the object distant object clearly thus, the focal length of eye lens increase while seeing distant object
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