s relativelysmall when the frecjuency differs in a marked degree from this critical value,and we may, when the periods of the free undamped vibrations of the vectorsdk are not too close together, retain only the one term of the summation in(10) and write s*.=nli-, ,- -*^-^--r (14). In order to… … Fig. 51. With centre 1 — lAJ2 and radius equal to ^/2 describe a circle in theplane representing the complex variable f+ t^; then the line joining thepoints 1 and (1 — iV) — t will cut this circle in the point P that corresponds tothe complex number /Z=. If then yu — x — yi, the absolute value of…
Optics
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