How can I solve this transcendental equation graphically?

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Timaway
Timaway 2018-10-4
回答： Mischa Kim 2018-10-4
n1=1.77, n2=1.45, n3=1, V=6.378, aE=1.07. Xi is the variable. I want to solve this equation graphically so that solutions will be the points at the interaction of two lines. Any information would be appreciated.

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Mischa Kim
Mischa Kim 2018-10-4
Timaway, define a vector Xi, e.g. using the linspace command. Then plot tan(Xi) and the right side of your equation into the same figure and find the intersection point.

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