Fresnel equations (normal incidence) |
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When light strikes a dielectric (non metal) surface (medium 2), from medium 1, some energy is transmitted and some is reflected. The intensities are governed by the Fresnel equations which are polarization dependent. For normal incidence the equations simplify. For normal incidence reflectance is given by....  For normal incidence transmittance is given by....  Note: R + T = 1 When light strikes glass, (n1 =1.50), from air, (n2 =1.00), 4% is reflected. At higher angles of incidence the reflectance increases. |