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image the point through which all parallel light rays reflect to in a concave mirror
normal line where the principal axis meets the mirror
fluorescence a perpendicular line from the point of incidence
phosphorescense the reflection of the item inside the mirror
reflection a line going through the centre of curvature and it is also a normal line
principal axis the change in direction of a light ray when it bounces off a surface
focal point when light is emmited because material is exposed to ultra-violet rays
vertex very much like fluorescence, but the material absorbing the UV light can emit visible light for minutes or hours

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