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How are we able to see nearby and also t...

How are we able to see nearby and also the distant objects clearly ?

Text Solution

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The human eye has the ability to adjust its focal length according to the distance of object, which is known as power of accomodation. While viewing distant objects, ciliary muscles of the eye relax which makes the eye les thinner. This increases the focal length of the eye lens so that a clear image of the object is formed on the retina. While viewing nearby objects, ciliary muscles contract which increases the curvature of the eye lens. This decreses the focal length of the eye lens so that a clear image of the object is formed on the retina.
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Knowledge Check

  • The change that occurs in the eye to see the distant objects clearly is

    A
    focal length of the eye lens decreases
    B
    curvature of the eye lens increases
    C
    focal length of the eye lens increases
    D
    ciliary muscles of the eye contract

  • The change that occurs in the eye to see the distant objects clearly is

    A
    focal length of the eye lens decreases
    B
    curvature of the eye lens increases
    C
    focal length of the eye lens increases
    D
    ciliary muscles of the eye contract

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