 | Friedrich Christian Accum - 1808 - 428 Seiten
...letting equal portions of each of them fall on a minute object; a printed page, for instance, which will not be seen distinctly at the same distance when illuminated by each. We must stand nearer the object when it is illuminated by the violet ; we see distinctly at a somewhat greater distance... | |
 | Thomas Thomson - 1817 - 596 Seiten
...will be seen hereafter. 10. The rays of light differ in their power of illuminating Illuminatobjects : For if an equal portion of each of these rays, one...illuminated by the indigo ray ; at a greater when vOL. I. c Book I. by the blue; at a still greater when by the deep green ; and Dmsionj. at tne greatest... | |
 | 1824 - 984 Seiten
...disposed to receive beat, form the coolest parts of our dress. The coloured rays of light are found to differ in their power of illuminating objects. For...it will not be seen distinctly at the same distance in each case. Those rays at the middle of the spectrum possess the greatest illuminating power, and... | |
 | John Lee Comstock, Sir Richard Phillips - 1822 - 260 Seiten
...power of illuminating objects. Illus. If an equal portion of each of these rays, one after the other be made to illuminate a minute object, a printed page for instance, it will not be seen at the same distance, when illuminated by each. 42. Light is capable of being absorbed by bodies, of... | |
 | John Lee Comstock - 1825 - 252 Seiten
...power of illuminating objects. Illus. If an equal portion of each of these rays, one after the other, be made to illuminate a minute object, a printed page for instance, it will not be seen at the same distance, when illuminated by each. 42. Light is capable of being absorbed by bodies, of... | |
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For if an equal portion of each of these rays, one after another, be made to illuminate a minute object, a printed page for instance, it will not be seen distinctly at the same distance when illuminated by each. We must stand nearest the object when it... 