When light travels from a higher refractive index medium to a lower refractive index medium, total internal reflection (TIR) can take place within medium 1 as long as the incident angle, theta , is greater than the critical angle, theta c . Calculate the angle for surface plasmon resonance if the prism has a refractive index of 1.55 and air with a refractive index of 1.0029 is on the other side of the gold film. The refractive index for the thin gold film is 2.06. Use the formula given:  ng is the refractive index of the gold film and n2 is the refractive index of medium 2

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