Question

When is the focal length of the eye lens of a normal eye maximum?​

Answer 1

Answer:

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Explanation:

When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means, radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina.

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Answer 2

Explanation:

focal length of the eye is 17mm (this is calculated from the Optometric diopter value).....

The more commonly accepted value, however, is 22mm to 24mm (calculated from physical refraction in the eye).

In certain situations, the focal length may actually be longer.