Sulfur hexafluoride (SF6) is a high-density gas that has refractive index, ns =

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Sulfur hexafluoride (SF6) is a high-density gas that has refractive index, ns = 1.8 at a specified pressure, temperature, and wavelength. Consider the retro-reflecting prism shown in Fig. 12.16. that is immersed in SF6. Light enters through a quarter-wave antireflective coating and then totally reflects from the back surfaces of the glass. In principle, the beam should experience zero loss at the design wavelength (Pwl = Pl0). (a) Determine the minimum required value of the glass refractive index, ng, so that the interior beam will totally reflect. (b) Knowing ns. find the required refractive index of the quarter-wave film, nf. (c) With the SF6 gas evacuated

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I can do this but need more points 1500 points is too low!!

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