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Tutorials: Useful Formulas

Spot Size



SAG (Sagitta) of a Spherical Surface



Depth of Focus (DOF)



Thick Lens Equation



Bevel Face Width (BFW)

Snell’s Law



Displacement Through Parallel Plate



Deviation Through Small Wedge



ETV (Edge Thickness Variation) and Wedge



Converting Between Waves and Fringes
(2 Different Wavelengths)



Converting Between Waves and Fringes
(Single Wavelength)