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...Lens Achromatic Lens is an achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. Cemented lens The cemented lens is also called an a...
..., after processing with mixed plasticizer and other processing , forms a dispersion paste in shape, so the paste resin or paste resin is named. It has medium viscosity, good foaming, high whiteness index and...