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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