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Calculate the critical angle of the prism ni*sin(theta i) = nr*sin(theta r) ni=1.65, nr=1, sin(theta r)=1...

Calculate the critical angle of the prism

ni*sin(theta i) = nr*sin(theta r)

ni=1.65, nr=1, sin(theta r)=1

I know how to plug things into the equation, but I don't know how to solve for the angle on a TI84 calculator.

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