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Telegraph GK Saturday

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dreamingJ | 08:31 Mon 18th Dec 2006 | Quizzes & Puzzles
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Last one: 40A - Glass with high refractive index and a low Abbe number of between 50-55 that is manufactured for use in instruments (7,5).

Thanks in advance.
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optical flint
Optical Flint
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So quickly-Thanks. Now to catch the post!

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