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Angle of refractionAngle of reflectionReal imagePath lengthApertureVirtual imageDispersionLensLightpathOptical axisTrajectoryMeridional rayFlight pathPhotologyPhase angleFresnel reflectionPath lossPencilOptical spectrumSunbeamLongitudinal aberrationLight equationFocal pointExit pupilPhotometryVertexOrbitLightSightlineReflectanceFocal planePathlinePolarimetryObject spaceBeamPrismVergencePhotometeorPhotographImage spaceRetroreflectionAngle of elevationLateral aberrationLine of sightLight curveLight spectrumCaustic surfaceOptical windowLuminous energyLight waveLongitudinal waveOptographyEclipticOptical astronomyField of viewOptical depthAngle of viewDepth perceptionCatadioptricsTelescopeLight fieldIlluminanceGravitational microlensingTransitPhotosphereDepth of fieldDefocus aberrationFocal depthCircular arcAngle bisectorFocusLineshapeReflectionSunlightPrimary mirrorDiacausticNormalTelephoto lensTransflectionPerspectivityGreat-circle distanceSpace motionLunar orbitLight dayProjectionTraveltimeBeamwidthRadiationInfrared telescopePlane of eclipticParfocal lensPhotoscopePrism lightingRadiusShadowMagnifying glassSunshinePupilSightGrammage