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Gaussian opticsGeometrical opticsFresnel diffractionBeam propagation methodPhysical opticsGaussian beamAngle of incidenceThin lensFraunhofer diffraction equationVisual angleLagrange invariantFraunhofer diffractionOptical proximity correctionScheimpflug principleCauchy's equationCaustic curvePhase angleSmall-angle scatteringSpherical aberrationDiffraction gratingNumerical apertureFocusPencilConformal opticsCollimatorSpatial filterRay tracingAplanatGradient-index opticsRotating wave approximationOpticsBeam divergenceApertureOptical powerPhase functionFresnel numberOptical axisConvex lensComplex beam parameterAutocollimationLensParabolic reflectorAiry diskImage circleRefracting telescopeObjectiveLensletStigmatismAdaptive opticsOptical aberrationShadowcastingCritical angleSpatial resolutionDouble-gauss lensParaboloidRefractive indexSpectrophotometryNormal lensApertometerFresnel equationsPupil functionPlane of incidenceCondenserTransfer-matrix methodLambert's cosine lawRayleigh scatteringOptical phase spaceMeniscus correctorRayleigh lengthPhased-array opticsSolar gravitational lensLaser diffraction analysisBeam parameter productOptical engineeringAchromatic telescopeGravitational lensing formalismAngular spectrum methodHyperlensStereoscopyFocal lengthCatadioptric systemAxonometryParabolic mirrorPseudorapidityMultiangle light scatteringFresnel zone plateCylindrical lensCamera resectioningGrismDepth of focusSmall-angle x-ray scatteringConoscopyOptic axisLight-scattering photometryBeam diameterMicrofacetReflecting telescopePolarimetryOptical instrumentGeometric albedo