Ophthalmic Optics第 18 / 100 题
Compared with crown glass, polycarbonate is valued mostly for what property?
a.Higher Abbe value
b.High impact resistance
c.Lowest cost
d.Scratch resistance without coating
解析
Polycarbonate is highly impact resistant, making it the preferred material for safety, children's, and sports eyewear. Its drawbacks include a low Abbe value and a soft surface that needs a scratch coating.
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