arybetween two media, the in-dex of refraction of the low-er with respect to the upperbeing n. A is the center ofa system of spherical wave-fronts, advancing from Atoward the surface CBD. Bis the foot of the perpendic-ular from A upon this sur-face, that is, the first point •*on CBD reached by each… … 64 LIGHT position as CxD. With the surface in its place, B becomes thecenter for a secondary wavelet in the upper medium whoseradius, at the instant when the incident wavefront reaches Cand D. will have acquired the length Bx = Bx. In the mean-time, other points such as M and N will also have been…
Light
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