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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