Based on your reading of "Take a Closer Look", We can say that the eye's lens is a convex lens. It creates an upside-down picture on the retina.
What is the convex lens?
An optical lens is made up of two spherical surfaces a convex lens The lens is called a biconvex lens or simply a convex lens if those surfaces are curved outwards.
Converging lens is another name for it. It's because it brings all the light rays that are parallel to the primary axis together at the focus point (F).
Based on your reading of "Take a Closer Look", We can say that the eye's lens is a convex lens. It creates an upside-down picture on the retina.
Hence the eye's lens is a convex lens. It creates an upside-down picture on the retina.
To learn more about the convex lens refer to the link;
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