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 30
travelsin rays. There really are no rays. The harder one tries toisolate a ray by itself, by letting light go first through a narrowslit or pinhole, and then passing it through a second slit or pinhole,the more do we find it impossible ; for then we notice the tend-encies to spread more than ever.… … Q Fig. 5. without either diverging or converging. If, however, wecan in any way so manage our experiments as to getripples with a hollow frontinstead of a bulging front,then the succeeding rippleswill converge as they march.This is shown in Fig. 5.Suppose FF is a hollow wave-front marching forward…
Light · X-rays
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