Incident - The incoming ray, Reflected - The outgoing ray, Normal - From which angles are measured, at right angles to the surface, Reflection - Angle between the normal and reflected ray, Incidence - Angle between the normal and incident ray, Refraction - Changes in the direction of light going from one material into another, Absorption - When energy is transferred from light to a material, Scattering - When light bounces off an object in all directions, Transparent - A material that allows all light to pass through it, Translucent - A material that allows some light to pass through it, Opaque - A material that allows no light to pass through it, Vacuum - A space in which there are no particles, light rays can pass through, Convex - A lens that is thicker in the middle which bends light rays towards each other, Concave - A lens that is thinner in the middle which spreads out light rays, Retina - Layer at the back of the eye with light detecting cells and where an image is formed.,

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