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in Physics by (58.2k points)

In which of the following two cases the focal length of the eye lens will be more

(a) When ciliary muscles of a normal eye is most relaxed. 

(b) When ciliary muscles of a normal eye is in most contracted state. Explain with reason.

1 Answer

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Best answer

The focal length of the eye lens will be more in case 

(a), i.e. when ciliary muscles of a normal eye is most relaxed. 

(b) Reason: When ciliary muscles are relaxed, the eye lens becomes thin. Thus, its focal length increases. In case when ciliary muscles is in most contracted state, radius of curvature of eye lens increases. Lens becomes thicker. This decreases the focal length of eye lens.

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