Principal (optical) axis, an imaginary line that passes through the exact center of the lens., refraction, the change of direction or bending of wave as is passes from one medium to another, Focal point, the point of convergence of light rays., incident ray, a ray that shows the direction that light travels as it approaches the boundary., Focal length, the distance from the lens to focal point., refraction ray, a ray that shows the direction that light travels after it has crossed over the boundary..

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