Talk:1 nanometre

This article was nominated for deletion. Please review the prior discussions if you are considering re-nomination:

Keep and refine to specific relevant sections, 2020 June 3, see discussion.
Merge to Orders of magnitude (length), 4 July 2016, see discussion.
No Consensus, 13 January 2013, see discussion.
Keep, 18 March 2008, see discussion.

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give the ratio of velocities of light rays of wavwlength 400nm and 800nm[edit]