Q3/A/We wish to coat a glass surface with an appropriate dielectric layer to provide total transmission fromair to the glass at a free-space wavelength of 570 nm. The glass has refractive index n3 = 1.45.Determine the required index for the coating and its minimum thickness.B/A 150-MHz uniform plane wave is normally incident from air onto a material whose intrinsic impedanceis unknown. Measurements yield a standing wave ratio of 3 and the appearance of an electric fieldminimum at 0.3 wavelengths in front of the interface. Determine the impedance of the unknownmaterial.

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B/A 150-MHz uniform plane wave is normally incident from air onto a material whose intrinsic impedance is unknown. Measurements yield a standing wave ratio of 3 and the appearance of an electric field minimum at 0.3 wavelengths in front of the interface. Determine the impedance of the unknown material.

B/A 150-MHz uniform plane wave is normally incident from air onto a material whose intrinsic impedance is unknown. Measurements yield a standing wave ratio of 3 and the appearance of an electric field minimum at 0.3 wavelengths in front of the interface. Determine the impedance of the unknown material.