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

Q.4.    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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The change in focal length of an eye - lens is caused by the action of the :

(c)\ ciliary\ muscles.

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