Light rays, imaginary lines that represent the motion of waves of visible light., Reflection, an image seen in a mirror or shiny surface., Refraction, the redirection of a wave as it passes from one medium to another., Photon, a particle representing a quantum of light or other electromagnetic radiation., Wavelength, the distance between two successive crests or troughs of a wave., Infrared, electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves..

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