Question

why our eye have a convex lens ?

Answer 1

A convex lens is thicker in the middle and thinner near the edges, and it causes the light rays that pass through it to bend so that they become closer together and ultimately focus on a point other side of the lens. Because convex lenses cause light to focus, or converge, they are also called converging lenses.

Answer 2

Answer:

Convex

Explanation:

Our eye is just like a normal setup, object -  lens -  screen

where the screen is the retina. we need to focus the light rays to focus on the retina for clear images and a convex lens forms real images, no other lens forms a real image.