Normal Reflection Coefficient The reflectivity of light from a surface depends upon the angle of incidence and upon the plane of polarization of the light. The general expression for reflectivity is derivable from Fresnel's Equations. For purposes such as the calculation of reflection losses from optical instruments, it is usually sufficient to have the reflectivity at normal incidence. This normal incidence reflectivity is given by Calculation to be added. Thin films Example calculation

Index Reflection concepts

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Multi-Layer Anti-Reflection Coatings A single layer anti-reflection coating can be made non-reflective only at one wavelength, usually at the middle of the visible. Multiple layers are more effective over the entire visible spectrum.	Index Reflection concepts Reference Meyer-Arendt
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