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Solution


Q.

The change in focal length of an eye lens is caused by the action of the:
1 Pupil  
2 Retina  
3 Ciliary muscles  
4 Iris  

Ans.

(3)

The change in focal length of an eye lens is caused by the action of the ciliary muscles. The ciliary muscles help in changing the shape of the lens, thus changing its focal length.