Opaque, Objects that absorb all light waves, Transparent, Objects that transmit all light waves, Translucent, Objects that transmit all light waves but scatter them, Refraction, When light changes direction because it has changed speed, Prism, Triangular shaped 3D object that refracts light into the spectrum, Incident ray, The ray of light that is going towards an object, Specular reflection, When the surface is smooth so the reflected image is clear, Diffuse reflection, When the surface is bumpy so the reflected image is unclear, Luminous, An object that emits light, Spectrum, The different colours that we can see (rainbow).

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