The change in focal length of an eye lens is caused by the action of the
NCERT Solution for Class 10 Science Chapter 11
The Human Eye and the Colorful World
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-198
Questions No-4
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(c) The relaxation or contraction of ciliary muscles changes the curvature of the eye lens. The change in curvature of the eye lens changes the focal length of the eyes. Hence, the change in focal length of an eye lens is caused by the action of ciliary muscles.
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(c) The action of ciliary muscles holding the eye lens changes the focal length of eye lens enabling the eye to focus the image of objects at varying distances.