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The focal length of the eye lens is chan...

The focal length of the eye lens is changed due to the action of the……….

A

pupil

B

retina

C

ciliary muscles

D

cornea

Text Solution

Verified by Experts

The correct Answer is:
A, C
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Knowledge Check

  • 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.

  • Focal length of thin lens ......

    A
    decreases with increase in refractive index.
    B
    increases with increase in refractive index.
    C
    doesn.t change with refractive index.
    D
    none of these

  • The focal length of a thin lens made from the material of refractive index 1.5 is 15 cm. When it is placed in a liquid of refractive index 4/3, its focal length will be______ cm.

    A
    80.31
    B
    50
    C
    78.23
    D
    60

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    The focal length of the lens in a photographic camera is 5cm. what is the power of the lens?

    If the focal length of objective lens is increased then magnifying power of ......

    The focal length of an equiconvex lens in air i equal to either of its radii of curvature. The refractive index of the material of the lens is …........

    The magnifying power of a telescope is m. If the focal length of the eye-piece is halved, then its magnifying power is .........

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