The change in focal length of an eye lens in human eye is caused by the action of the:
Pupil
Retina
Iris
Ciliary muscles
A
Ciliary muscles
B
Iris
C
Retina
D
Pupil
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Solution
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The ciliary muscle is located in the eye and surrounds the lens. It contracts or relaxes in order for an individual to see at multiple distances. When it contracts, it pulls forward, moving to a frontal portion to relax the fibers that hold the lens in place; this process also allows it to take on a more spherical shape to provide short range focus.
Hence, ciliary muscles changes the focal length of eye lens.
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