1] which part of eye helps to change the focal length of eye lens ?
2] what is the image distance in the normal human eye ?
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The image distance in the eye, is fixed and cannot be changed. The ability of the eye lens to adjust its focal length is called accommodation. Due to this eye can increase or decrease focal length of the lens in order to see either close or distant objects.
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- Answer: Ciliary muscles help in changing the focal length of the eye lens
- Answer : The far point of a human eye is the farthest object distance that a typical eye is able to image onto the retina. It is at infinity for the "normal" eye. In the figure below the focal length of the accommodating normal eye is plotted versus the object distance. For the relaxed eye the focal length is 2 cm.
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