I have calculated the amplitude of three interfering waves as a function of \(\theta\):
\(\sqrt{\frac{P_{2}}{4 \pi}} \frac{1}{r}[1 + 4exp(i(\phi_{3} - \phi_{2} + kdsin \theta)) + \frac{1}{4}exp(i(\phi_{1} - \phi_{2} - kd sin \theta))]\)
I now want to find the intensity, i.e. the square of the amplitude. Should I start by converting the exp terms into cos and sine? And is it only the real part that I should concentrate on?
\(\sqrt{\frac{P_{2}}{4 \pi}} \frac{1}{r}[1 + 4exp(i(\phi_{3} - \phi_{2} + kdsin \theta)) + \frac{1}{4}exp(i(\phi_{1} - \phi_{2} - kd sin \theta))]\)
I now want to find the intensity, i.e. the square of the amplitude. Should I start by converting the exp terms into cos and sine? And is it only the real part that I should concentrate on?
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