Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 51
retardation thatthey experience on enter-ing affect their march ?^ Suppose that at a certainmoment a ripple has gotas far as FF. If it hadbeen going on throughair it would, after a veryshort interval of time, have got as far as GG. Butit has struck against the glass, and the part that goesin first… … Fig. 19. i LIGHTS AND SHADOWS 35 tance that the light would have had to go if afterpassing the surface it could have gone on to GG. Theoverlapping wavelets build up the new wave-front HO,which you notice is a flatter curve, and has its centresomewhere farther back at Q. In fact, the effect of…
Light · X-rays
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