The changein focal length of an eye lens is caused by the action of the
(a) pupil
(b) retina
(c) ciliarymuscles
(d) iris

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Solution

(c) The relaxation or contraction of ciliary muscles changes thecurvature of the eye lens. The change in curvature of the eye lenschanges the focal length of the eyes. Hence, the change in focallength of an eye lens is caused by the action of ciliary muscles.

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The changein focal length of an eye lens is caused by the action of the(a) pupil(b) retina(c) ciliarymuscles(d) iris

(c) The relaxation or contraction of ciliary muscles changes thecurvature of the eye lens. The change in curvature of the eye lenschanges the focal length of the eyes. Hence, the change in focallength of an eye lens is caused by the action of ciliary muscles.

The changein focal length of an eye lens is caused by the action of the
(a) pupil
(b) retina
(c) ciliarymuscles
(d) iris