[{"n": "Illuminance", "u": "/e/optics-and-photonics/illuminance/", "s": "Measure of incident light per unit area weighted for human vision."}, {"n": "Intensity (physics)", "u": "/e/optics-and-photonics/intensity-physics/", "s": "Power transferred per unit area perpendicular to energy propagation."}, {"n": "Iridescence", "u": "/e/optics-and-photonics/iridescence/", "s": "Color that shifts with angle, caused by light interference."}, {"n": "Linear polarization", "u": "/e/optics-and-photonics/linear-polarization/", "s": "Linear polarization confines the electric field to a single plane."}, {"n": "Luminance", "u": "/e/optics-and-photonics/luminance/", "s": "Photometric measure of luminous intensity per unit area in a given direction."}, {"n": "Luminous flux", "u": "/e/optics-and-photonics/luminous-flux/", "s": "Measure of perceived light power weighted by human eye sensitivity."}, {"n": "Luminous intensity", "u": "/e/optics-and-photonics/luminous-intensity/", "s": "Measure of perceived power per unit solid angle."}, {"n": "Magnification", "u": "/e/optics-and-photonics/magnification/", "s": "Magnification enlarges apparent size without changing physical size or perspective."}, {"n": "Moiré pattern", "u": "/e/optics-and-photonics/moir-pattern/", "s": "Interference pattern from overlaid similar patterns."}, {"n": "Newton's rings", "u": "/e/optics-and-photonics/newton-s-rings/", "s": "Interference rings from light between spherical and flat surfaces."}, {"n": "Nonlinear optics", "u": "/e/optics-and-photonics/nonlinear-optics/", "s": "Branch of optics studying intensity-dependent optical properties of matter."}, {"n": "Opacity", "u": "/e/optics-and-photonics/opacity/", "s": "Measure of impenetrability to radiation, especially visible light."}, {"n": "Optical aberration", "u": "/e/optics-and-photonics/optical-aberration/", "s": "Deviation from ideal image formation in optical systems."}, {"n": "Optical depth", "u": "/e/optics-and-photonics/optical-depth/", "s": "Dimensionless measure of radiant power attenuation through a material."}, {"n": "Optical path length", "u": "/e/optics-and-photonics/optical-path-length/", "s": "Vacuum distance light travels in the time to traverse a medium."}, {"n": "Optical power", "u": "/e/optics-and-photonics/optical-power/", "s": "Measure of a lens's ability to converge or diverge light."}, {"n": "Phase (waves)", "u": "/e/optics-and-photonics/phase-waves/", "s": "Angle-like quantity representing the fraction of a cycle covered."}, {"n": "Phase velocity", "u": "/e/optics-and-photonics/phase-velocity/", "s": "Speed of a wave's constant-phase surface."}, {"n": "Photometry (optics)", "u": "/e/optics-and-photonics/photometry-optics/", "s": "Branch of optics measuring light as perceived by the human eye."}, {"n": "Photonic crystal", "u": "/e/optics-and-photonics/photonic-crystal/", "s": "Periodic nanostructures that control light propagation via photonic band gaps."}, {"n": "Photonics", "u": "/e/optics-and-photonics/photonics/", "s": "Branch of optics applying light in photon form across technologies."}, {"n": "Physical optics", "u": "/e/optics-and-photonics/physical-optics/", "s": "Branch of optics studying wave phenomena beyond ray approximation."}, {"n": "Planckian locus", "u": "/e/optics-and-photonics/planckian-locus/", "s": "Path of black body color as temperature changes in chromaticity space."}, {"n": "Plane wave", "u": "/e/optics-and-photonics/plane-wave/", "s": "A wave model with constant value on perpendicular planes."}, {"n": "Ray (optics)", "u": "/e/optics-and-photonics/ray-optics/", "s": "Geometrical model of light propagation used in optical analysis."}, {"n": "Rayleigh scattering", "u": "/e/optics-and-photonics/rayleigh-scattering/", "s": "Rayleigh scattering explains why the sky is blue."}, {"n": "Reflection coefficient", "u": "/e/optics-and-photonics/reflection-coefficient/", "s": "Parameter describing wave reflection at impedance discontinuities."}, {"n": "Snell's law", "u": "/e/optics-and-photonics/snell-s-law/", "s": "Law describing refraction of light between two isotropic media."}, {"n": "Spherical aberration", "u": "/e/optics-and-photonics/spherical-aberration/", "s": "Spherical aberration degrades image quality in spherical optical systems."}, {"n": "Stokes parameters", "u": "/e/optics-and-photonics/stokes-parameters/", "s": "Set of values describing polarization state of electromagnetic radiation."}, {"n": "Superposition principle", "u": "/e/optics-and-photonics/superposition-principle/", "s": "Net response equals sum of individual responses in linear systems."}, {"n": "Wave", "u": "/e/optics-and-photonics/wave/", "s": "A propagating disturbance that transfers energy through space and time."}]