The human eye can focus on objects at different distances by adjusting the focal
length of the eye lens. This is due to
(a) presbyopia.
(b) accommodation.
(c) near-sightedness.
(d) far-sightedness.
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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 the focal length of the lens in order to see either close or distant objects.
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