n is greatest near the points of scura was invented by Baptista Porta, and certainly no one from any one luminous point will be refracted to a point the léns, A, because the angle between its two surfaces is who ever beheld the image produced in this well known in- on the other side of the lens,… … will pass to one, and the violet to the other, end of a band acute as we pass from the center to the ends, C and D, Fig. permanence, of that immortality which she could confer. called the spectrum, in which the other colors occupy inter- 3. Jn this figure we have three out of many rays striking…
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