| http://www.w3.org/ns/prov#value | - where n is a refraction index, A1 is an obtuse angle formed between the main axis of the lens and a tangent line of a point on the curved centermost surface 11, and A2 is an acute angle formed between a line linking the center of the light emitting chip 15 to the corresponding point of the curved centermost surface 11 and the main axis of the lens.
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