Talk:Light beam

External links modified
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 * Added archive https://web.archive.org/web/20060117034244/http://news.gov.hk/en/category/businessandfinance/051121/html/051121en03016.htm to http://news.gov.hk/en/category/businessandfinance/051121/html/051121en03016.htm

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Science
Types of beam of light 157.51.181.192 (talk) 02:02, 6 February 2022 (UTC)