| 11. | It is also used in making optical glasses and lenses.
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| 12. | Budget models may not use optical glass at all, and some really cheap ones use plastics.
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| 13. | The new Jena optical glass also opened up the possibility of increased performance of photographic lenses.
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| 14. | Multi-element precision ground optical glass with anti-reflection coatings.
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| 15. | They include a melted telescope mirror and a piece of melted optical glass ( flint ).
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| 16. | Optical wedges and reflections from uncoated optical glass surfaces are used to attenuate high power laser beams.
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| 17. | AN-6530 lenses are ground and polished optical glass, approximately of an inch ( 2.4 mm ) thick.
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| 18. | It can be argued that casting of this mirror launched the optical glass industry in the United States.
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| 19. | The first attempt to fabricate the primary mirror was made by the Lytkarino Optical Glass Factory, near Moscow.
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| 20. | The difficulties of fabricating two disks of optical glass required to make a large achromatic lens were formidable.
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