The correct answer is 4 - 1 - 3 - 5 - 2.Concept:The Human eye: Humans have paired eyes that are located in sockets of the skull called orbits. The eyes are one of the sense organs that give the sensation of sight.Explanation:Structure of the human eye:The wall of the eyeball is composed of three layers- the outer sclera, middle choroid, and inner retina.The anterior portion of the sclera is called the cornea. It is transparent. The choroid becomes thick in the anterior part to form the ciliary body.The ciliary body continues forward to form a pigmented and opaque structure called the iris which is the visible coloured portion of the eye.A transparent crystalline lens is held in place by ligaments attached to the ciliary body behind the iris. In front of the lens, the aperture surrounded by the iris is called the pupil.The retina has two specialized cells- rods and cones that perceive colour and daylight vision.The pathway of light rays (photons) entering our eye: