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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