Question

How is the eye able to see distant and near objects so clearly?

a)Because eyes have camera in it
b)Because the eyes can easily adjust
c)Because the eyes can become big and small
d)Because eyes are the most sensitive organ of the body

Answer 1

Hint: The human eye has a lens that has an ability called accommodation that enables it to maintain a clear image of objects as the distance varies.

Complete answer:

Humans are vertebrates and the vertebrate eye can change its optical power to maintain a clear image of objects at various distances. When the ciliary muscles of the eyes are relaxed, the lens of the eyes becomes thin; the focal length increases and thus enables us to see the distant objects clearly. When the ciliary muscles contract, the eye lens becomes thicker and the focal length decreases, making nearby objects clearly visible. The human eye lens is able to adjust its focal length to view both nearby and distant objects on the retina of the eye. This ability to adjust the focal length is called the power of accommodation of the eyes. Therefore, Option b “because the eyes can easily adjust” is the correct answer.

Option a “Because eyes have the camera in it” is incorrect as there is no camera in the eyes. Eyes have a lens.
Option c “Because the eyes can become big and small” is incorrect because the eyes almost remain the same in size from our birth time. The dimensions hardly change by a few (1-2) millimeters.
Option d “Because eyes are the most sensitive organ of the body” is invalid in this context. Eyes are sensitive organs but this has no relation with its ability to see distant or nearby objects.

Note: It’s the lens that adjusts, not the size of the eyes that changes.