Final answer:
The information provided does not directly answer the question about the drainage angle formed by the iris and cornea but discusses the optical properties and image formation of the eye involving the cornea and lens.
Step-by-step explanation:
The drainage angle referred to in the question is an anatomical feature in the eye related to fluid dynamics and pressure regulation, primarily associated with glaucoma. However, the provided information pertains to the optical properties of the eye, particularly how the cornea and lens contribute to image formation on the retina. The eye's focusing mechanism works as a compound lens system, where the cornea is the primary contributor, accounting for about two-thirds of the focusing power due to its curvature and the substantial change in the speed of light when it passes from air into the cornea.
The lens provides the finer tuning necessary for sharp image formation. Despite the multiple layers the light travels through, they act like a single convex lens, creating a real, inverted image, which the brain later corrects to perceive it as upright.