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Achromatic lensRefracting telescopeApochromatReflecting telescopeAplanatLensPrism spectrometerSchmidt corrector plateReflecting microscopeNewtonian telescopePrismDialytic telescopeTelespectroscopeEyepieceApertometerSpectropolarimeterSpherical aberrationApertureMeniscus correctorNasmyth telescopeCylindrical lensSpectrometerChromoretinoscopySpectrophotometerSpectroheliographInterference microscopeOpticMonochromatorOptical telescopeMicrospectroscopeChromatoscopeChromatic aberrationPhotomicroscopeAstigmatismCondenserDobsonian telescopeDoubletConvex lensAstronomical filterPhase angleBeam splitterPhotochromic lensOptic axis of a crystalSchmidt cameraDispersive prismChromoscopeCollimatorCoronographOptical rectennaConoscopyInterference filterPolarizerPolarization controllerWood's glassSpectropolarimetryOptical microscopeDouble-gauss lensOptical spectrumUltramicroscopeConfocal microscopyLiquid mirror telescopeTheodoliteRelay lensPolychromatorEtalonAlethoscopeCoelostatHelioscopeOptic axisSpectroradiometerPhotographic filterTeinoscopeGrismImage circleOptical axisMicroscopeWollaston's doubletAutocollimatorCorrective lensGoniophotometerDiopterOptical proximity correctionCompound microscopeOptical isolatorMegalethoscopeStereocomparatorOptical modulatorCatadioptric systemPhotoelastic modulatorObjectiveLight microscopeWater telescopeRadio telescopeFinderscopeStereoscopeDichroic filterTerrestrial telescopeDiffractometerTelephoto lensNicol prism