incident light

• reflectionReturned light or thought
• refractionWave bending between media
• beamStructural support member
• rayNarrow light emission
• photonElectromagnetic radiation unit

surface · angle · wavelength · absorption · optics · prism · mirror · lens · glow · illumination · scatter · transmission · brightness · spectrum · shadow · glare · radiance · luminous

• Dermoscopydermatoscope, polarized light, magnification, handheld device
• photoelectricsphotoemission, photoelectron, photocell, photodetector, photodiode