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Main Optical Formulas

Formulas for single lens (in air) Focal length of two ideal lenses Numerical aperture F number Theoretical spot diameter of lens Focal length of concave mirror Magnification of beam expander Light refraction (Snellfs law) Light shifted by parallel windows Angle of beam deflection by wedge window Surface reflectance (in air) Critical angle Brewster angle Optical density (OD)

Formulas for single lens (in air)

Coding rule of lenses (when light moves from left to right)

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Focal length of two ideal lenses

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Numerical aperture(Numerical Aperture : NA)

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F number

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Theoretical spot diameter of lens

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Focal length of concave mirror

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Magnification of beam expander

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Light refraction (Snellfs law)

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Light shifted by parallel windows

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Angle of beam deflection by wedge window

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Surface reflectance (in air)

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Critical angle

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Brewster angle

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Optical density (OD)

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