. Biophysical science. Biophysics. 600 Appendix B bent to pass through the front focal point f2. Line (b) is constructed in a similar fashion. Finally, (c) is a line joining the end of the object with the center of curvature r. This line is undeviated as it is normal to the interface. Any two of the three lines (a), (b), and (c) are sufficient to locate and to determine the size of the object. The three points —f1} f2, and r are sufficient with the optic center o to permit all constructions. The point r is related to fx and f2 by the equation r=f2-fi (10) In the eye, light passes through four
. Biophysical science. Biophysics. 600 Appendix B bent to pass through the front focal point f2. Line (b) is constructed in a similar fashion. Finally, (c) is a line joining the end of the object with the center of curvature r. This line is undeviated as it is normal to the interface. Any two of the three lines (a), (b), and (c) are sufficient to locate and to determine the size of the object. The three points —f1} f2, and r are sufficient with the optic center o to permit all constructions. The point r is related to fx and f2 by the equation r=f2-fi (10) In the eye, light passes through four approximately spherical surfaces, separating media of different indices of refraction. Equation 9 could be Object n. Interface. Optic Axis Figure 5. Ray diagram illustrating refraction by a curved interface between two media of indices of refraction nx and n2. The interface is a small spherical section with center of curva- ture at r. Any two of the three rays, a, b, and c, are sufficient to determine the location and size of the image. used successively at each of these surfaces, noting that the image formed by one surface is the object of the next. It is quite possible to have virtual objects under these conditions. Although the preceding is all that is necessary to discuss the geometrical optics of the eye, a somewhat more generalized approach that lumps the effects of several surfaces is neater. For example, by applying Equation 9 twice, one can solve the problem of a single lens. To illustrate this, suppose a medium of index of refraction n2 separates two others of indices of refraction nx and n3, respectively. The surfaces of separation are assumed to be small sections of spheres whose line of centers is referred to as the optic axis. The radius of the surface separating the media of indices of refraction nx and n2 will be designated by ra, and the radius of the other surface by rb. If the object is located at a distance —p along the optic axis from the first surface,
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