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 89
Fig. 41. Fig. 42. measures the curvature impressed on the plane wave.Hence F=2R . . . [17] In Cambridge notation 1 2 or f=r-. J 2 It is equally easy to establish the formula for the actionof a curved mirror on a curved wave. The principle of app. REFLEXION FORMUL.I. superposition at once leads to a…
Light · X-rays
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