Flint glass:
Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion). Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less.
en.wikipedia.org
燧石玻璃:
燧石玻璃，也稱為火石玻璃，是具有高折射率和低阿貝數的光學玻璃。
zh.wikipedia.org
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Flint glass燧石玻璃