 | John William Draper - 1847 - 392 Seiten
...this is succeeded on each side by a dark one ; this, again, by a bright one, and so on alternately." Upon the undulatory theory, all this is readily explained....the middle of its shadow, that is, along the lines ac, be, have gone through paths of equal length, and, therefore, when they encounter at the point e,... | |
 | Henry Draper - 1868 - 534 Seiten
...and the undulations of light in the same manner flow round at the back of the cylinder ab, Fig. 80. And now it is plain that two series of waves which...passed from the sides of the obstacle to the middle -of the shadow, that is, along the lines ae, be, have gone through paths of equal length, and, therefore,... | |
 | Henry Mills Alden, Frederick Lewis Allen, Lee Foster Hartman, Thomas Bucklin Wells - 1877 - 968 Seiten
...light in the same manner flow round at the back of the cylindrical object a 6. Now it is plain that the two series of waves which have passed from the sides...to the middle of its shadow — that is, along the Hues а е,Ь е — have gone through paths of equal length, and therefore when they encounter at... | |
 | Henry Mills Alden, Frederick Lewis Allen, Lee Foster Hartman, Thomas Bucklin Wells - 1877 - 974 Seiten
...the same manner flow ronnd at the back of the cylindrical object a !•• Now it is plain that the two series of waves which have passed from the sides of the obstacle to the middle of ita shadow — that is, along the lines ae, be — have gone through paths of equal length, and therefore... | |
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Waves upon water pass round to the back of an object on which they impinge, and the undulations of light in the same manner flow round at the back of the piece of wire, ab, Fig. 