Luminous - Makes its own light, Non-luminous - Does not make it's own light, Convex - A lens that bends light inwards towards a focal point., Concave - A lens that causes light to spread outwards., Reflection - When light hits an object and bounces off, Refraction - When light changes speed and direction as it enters a different material., Angle of refraction - The angle between the light ray and the normal., Angle of incidence - The angle between the incident ray and the normal., Incident ray - The incoming beam of light, Reflected ray - The outgoing ray of light. , Opaque - No light can pass through., Transparent - Light can pass through it easily, Translucent - Lets light pass through but cannot be seen through easily., Normal Line - A line drawn at right angles to the surface where the ray hits.,

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