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Refractive indexFresnel numberFocal lengthOptical powerApertureApertometerF-numberOptical depthPupil functionOptical transfer functionBeam divergencePhase angleThin lensDepth of focusLens speedEtendueAngle of incidenceParaxial approximationAbbe numberOptical aberrationOptical resolutionLuminous intensityCauchy's equationMode field diameter35 mm equivalent focal lengthVisual angleSpectral indexOpticsLagrange invariantEye reliefAttenuation coefficientDiffraction limitLuminanceSpectral resolutionLuminous fluxAiry diskSpatial resolutionLight reflectance valueSpectrophotometryFree spectral rangeGaussian opticsComplex beam parameterBeam diameterOscillator strengthOptical phase spaceCalibrated focal lengthResolving powerOptical engineeringAbsorbanceDiopterGaussian beamOptical axisLinewidthOptical parametric amplifierTransparency and translucencySpherical aberrationObjectivePhysical opticsPhase functionLensHyperfocal distanceCritical angleOpacityBeam parameter productAbsorption coefficientDiffraction gratingKnudsen numberAzimuthal quantum numberRadianceSpectroradiometerLuminosity functionOptical instrumentSpectrophotometerPenetration depthSpectral power distributionDiffraction efficiencyM squaredColor temperatureLumenColor rendering indexSpectral sensitivityImage circleGroup velocity dispersionFocusAngular resolutionMass attenuation coefficientPhased-array opticsSurface brightnessExposureCoupling coefficient of resonatorsEntrance pupilAbsorptanceDefocusGradient-index opticsDepth of fieldOptical conductivityEinstein coefficientsConstringenceSpatial filterLaser beam quality