. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 406 THE SENSORIAL FUNCTIONS. the point where the ray meets the new medium, perpendicular to the refracting surface. Thus the ray r, Fig. 408, striking obliquely on the surface of a denser medium, at the point s, instead of pur- suing its original course along the line s o, is re- fracted, or turned in the direction s t, Mhich is a line situated between s o, and s p ; this latter line being drawn perpendicularly to the surface of the medium, at the point s, a
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 406 THE SENSORIAL FUNCTIONS. the point where the ray meets the new medium, perpendicular to the refracting surface. Thus the ray r, Fig. 408, striking obliquely on the surface of a denser medium, at the point s, instead of pur- suing its original course along the line s o, is re- fracted, or turned in the direction s t, Mhich is a line situated between s o, and s p ; this latter line being drawn perpendicularly to the surface of the medium, at the point s, and within that medium. When the ray arrives at t, and meets the posterior 408. surface of the dense medium, passing thence into one that is less dense, it is again refracted accord- ing to the same law; that is, it inclines towards the perpendicular line t t, drawn from t, within the denser medium, and describes the new course t u instead of t v. The amount of the deflection corresponds to the degree of obliquity of the ray to the surface which refracts it; and is mathematically expressed by the law, that the sines of the two angles formed with the perpendicular by the inci- dent and the refracted rays retain, amidst all the variations of those angles, the same constant pro- portion to one another. We may hence derive a simple rule for placing the plane of the refracting surface so as to produce the particular refraction we wish to obtain. When a ray is to be deflected. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roget, Peter Mark, 1779-1869. London : W. Pickering
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