Chapter 35327Section 35.6Huygen’s Principle*P35.28(a)For the diagrams of contour lines and wave fronts and rays, see Figures (a) and (b) below.As the waves move to shallower water, the wave fronts bend to become more nearly parallelto the contour lines.(b)For the diagrams of contour lines and wave fronts and rays, see Figures (c) and (d) below.We suppose that the headlands are steep underwater, as they are above water. The rays areeverywhere perpendicular to the wave fronts of the incoming refracting waves. As shown,the rays bend toward the headlands and deliver more energy per length at the headlands.(a)Contour lines(b)Wave fronts(c)Contour lines(d)Wave frontsand raysand raysFIG. P35.28Section 35.7Dispersion and PrismsP35.29From Fig 35.21nv=1 470.at 400 nmandnr=1 458.at 700 nm.Then1 001 470.sin.sinθθ=vand1 001 458.sin
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