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Caution Fill in all input cells. Choose all parameters unit. The plate material is supposed to be a dielectric. Consequently there is an air/glass and a glass/air reflection introducing an additionnal phase shift of π. n can be either a numeric value or the reference of a glass from the catalog. If a reference of a glass is selected, the calculation considers the refraction index of this glass at the wavelength lam defined in the current page. All parameters are positive.