In human vision, the curvature of the cornea provides much of the power of the v
ID: 2269130 • Letter: I
Question
In human vision, the curvature of the cornea provides much of the power of the visual system; light rays bend inward as they pass from air into our cornea. This is not the case in fish; in the figure at right, the rays are bent by the lens but not bent when they enter the cornea. Why is that?
Reflection of light rays Incoming parallel rays are focused to a y the tapetum point on the retina. The rays are reflected ... and refracted by the lens to form a set of parallel rays traveling back to the source. TapetumExplanation / Answer
underwater eye usage: light goes from water (n=1.33) into eye fluid (n=about the same). In this case, the n difference is much less, so the bending of light going from water into the eye is less. Thus to form the image at right spot, the rays are bent by the lens but not bent when they enter the cornea.