FLP Vol I Ch 30-1: Help understanding adding vectors' magnitude and phase please

  • #1
Special K
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I’m having trouble understanding section 30.1 of FLP Vol 1. Particularly the first figure is causing me struggle. I understand magnitude and phase, such as fig 29-9 when 2 waves are added to get an effective resultant vector. But I’m struggling to see how equation 30.3 is applicable when it’s derived from geometric arguments that the oscillators are in a circle, what the vectors in 30-1 represent, and when this equation is applicable. Could anyone offer insight here, I’m just totally lost on this section.

Thanks, I know it wasn’t a great question, but I follow all the math, I just don’t understand what’s going on physically, and it is also making me not understand fig 30-3.
 

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  • #2
Vanadium 50
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FLP?
 
  • #4
Lord Jestocost
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Fig. 30.1 uses the graphical method of phasors to compute the sum of sine functions with phase differences. Have a look at chapter 2 "Calculation of the intensity by the method of phasors" in:
Intensity of single slit diffraction - SCIPP
 

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