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Spherical mirrorRefracting telescopeReflecting telescopeOptical cavityCosmospherePlasma globeBlackbodyOptical ring resonatorsReflecting circleDebye sphereIntegrated optical circuitArmillary sphereDisco ballPhotonic integrated circuitPinhole occluderAbsorption cellBorescopeDielectric mirrorBubble chamberOptical head-mounted displaySpace-filling modelParabolic reflectorLight tubeOptical filterDiffraction gratingHohlraumLight field cameraSpherical aberrationCenosphereSpherical robotFresnel zone plateOptical coatingSubsurface scatteringOptical telescopeSphere of influenceOptical black holeHolographic gratingOptical instrumentElectro-optic modulatorCassegrain reflectorMie scatteringOptical spectrometerMulti mode interferometerSpherometerLiquid mirror telescopeDiffuserHot mirrorLight millSpatial light modulatorParabolic mirrorBlack hole cosmologyBloch spherePrism glassFiber bragg gratingSpherical bearingCatadioptric systemSpatial filterSealed beamVacuum tubeFloatPhoton sphereMicrowave cavityMicrocavityReflector sightFiber-optic sensorTranslucent concreteOptical mesh networkHoberman sphereHubble volumeOpto-isolatorIntegral field spectrographGlobe valveJanus particleInterferometerElectron tubeSkydomeOptical microscopeOptical add-drop multiplexerDistributed feedback laserBubblegramPrismHyperlensDiaphragmInterference filterTeleidoscopeTrackballPhotomultiplier tubeGrismPinhole cameraAcousto-optic modulatorIntegral imagingAchromatic lensChromatoscopePlasma lampHorton sphereFiberscopeSplit-ring resonatorOpaque projectorHalogen lampLaser guide star