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What happens to the focal length of the ...

What happens to the focal length of the eye lens when ciliary muscles (i) relax (ii) contract ?

Text Solution

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(i) When ciliary muscles relax, eye lens becomes thinner and its focal length increases.
(ii) When ciliary muscles contract, eye lens becomes thicker and focal length decreases.
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Knowledge Check

  • The focal length of the eye lens increases when eye muscles

    A
    are relaxed and lens becomes thinner
    B
    contract and lens becomes thicker
    C
    are relaxed and lens becomes thicker
    D
    contract and lens becomes thinner

  • The focal length of the eye lens increases when eye muscles

    A
    are relaxed and lens becomes thinner
    B
    contract and lens becomes thicker
    C
    are relaxed and lens becomes thicker
    D
    contract and lens becomes thinner

  • The change in focal length of an eye lens is caused by the action of the

    A
    pupil
    B
    retina
    C
    ciliary muscles
    D
    iris

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