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FocusSpot lensDiffraction limitOptical powerCircle of confusionDiffraction gratingImage circleApertureRefracting telescopeOptical aberrationFraunhofer diffraction equationObjectiveNumerical apertureLensPupil functionFraunhofer diffractionGaussian opticsOptical telescopeConvex lensDiffraction patternSpherical aberrationParaxial approximationOptical microscopeGeometric albedoBeam divergenceFresnel zone plateOpticsThin lensReflecting telescopeHyperfocal distanceStigmatismVisual angleCaustic curveAplanatEye reliefAngle of incidenceSpatial filterApertometerPhased-array opticsPhase functionAchromatic lensEntrance pupilTransparency and translucencyAchromatic telescopeOptical instrumentDepth of focusConformal opticsMagnetic lensTelecentric lensGaussian beamPlane of incidenceDiaphragmFresnel equationsOptical engineeringVirtual focusOptical flatNormal lensCylindrical lensLight microscopeLuminous intensityPhysical opticsDefocusOptical axisAngular resolutionCondenserHigh-power fieldPrismDepth of fieldLaser beam qualityLight field cameraPhase angleReflecting circleOptical lens designMode field diameterDiffractometerDiffuserPencilBarlow lensFree spectral rangeGrismHyperlensEtendueOptical latticeStaring arrayCritical angleFresnel diffractionLaser diffraction analysisMicroscopyOptical spectrometerMicroprismScheimpflug principleDispersive prismFocal lengthDialytic telescopeSphere of influenceHot spotCatadioptric systemAstigmatismApochromatAbbe sine condition