Octopus Eyes To focus its eyes, an octopus doesnot change the shape of its lens,

Question

Octopus Eyes To focus its eyes, an octopus doesnot change the shape of its lens, as is the case in humans.Instead, an octopus moves its rigid lens back and forth, as in acamera. This changes the distance from the lens to the retina andbrings an object into focus.

If an object moves closer to an octopus, must the octopus move itslens closer to or farther from its retina to keep the object infocus?

Choose the best explanation fromamong the following:

The lens must move closer to the retina-thatis, farther away from the object-to compensate for the objectmoving closer to the eye.
When the object moves closer to the eye, theimage produced by the lens will be farther behind the lens;therefore, the lens must move farther from the retina
Choose the best explanation fromamong the following:

The lens must move closer to the retina-thatis, farther away from the object-to compensate for the objectmoving closer to the eye.
When the object moves closer to the eye, theimage produced by the lens will be farther behind the lens;therefore, the lens must move farther from the retina

Explanation / Answer

The lens will move further away from the retina to make the focallength greater. Before the adjustment the octopus would have thesame problem as a human with farsightedness, where the light raysdo not intersect until past the wall of the retina.

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