When the ciliary muscles are relaxed, the focal length of the eye lens [[1]].

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Detailed Solution

When the ciliary muscles are relaxed, the focal length of the eye lens increases.
The lens becomes thin and the focal length of the eye lens rises when the ciliary muscles are relaxed. In order to view distant objects, the lens can extend its focal length.
●       The ciliary muscles of the eye control the lens's focal length.
●       When observing an object up close, the focal length must be short.
●       The thick lens has a shorter wavelength.
●       The lens thins as a result of the ciliary muscles contracting.
●       If we need to view something from a distance, we need lenses with a large focus.
●       On the narrow lens, the focal length is longer.

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