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The addition of barium also enhances the refractive index. Thorium oxide gives glass a substantial refractive index and lower dispersion and was previously used in creating substantial-top quality lenses, but as a result of its radioactivity has been changed by lanthanum oxide in fashionable eyeglasses.[eighty four] Iron is usually included https://door-supplier33197.blog-a-story.com/9676957/not-known-factual-statements-about-door-supplier

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