Question

What happens to the image distance in the normal human eye when we decrease the distance of an object, say $10\mathrm{m}$ to $1\mathrm{m}$? Justify your answer.

Answer 1

Image formation:

1. As a result of the capacity to accommodate, when we modify the object distance within set limitations, the image distance remains unchanged. Even when an object's distance from either the eye increases, this same picture is produced exclusively on the retina.
2. Our eyes have always had the capacity to accommodate, which means they may extend or reduce the focal length of their lens so that the picture is always created on the retina of our eye.
3. As a result, increasing the distance of an item has no effect on the picture distance in the eye.

Therefore, whenever we reduce the distance between an item from $10\mathrm{m}$ to $1\mathrm{m}$, our eye's focal length adjusts to focus this same picture upon that retina itself.