Double Refraction
Publishes observations of double refraction in Iceland spar.
Permanent historical records · Updated 2026-11-03
1669 in Denmark
Explore 2 historical events and records for Denmark in 1669.
Historical records for Denmark in 1669
Sorted by month and day. Records with no month are shown last. Showing 2 of 2 unique records.
2Unique records
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2Named events on this page
1Named people on this page
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Other events (month unknown)
Iceland Spar Experiment
Shows that one crystal can split a light ray into two paths.
How these records were prepared
Generated from the World History Database historical_events table. Identical display records are collapsed; descriptions otherwise retain the stored text. Coverage and source quality vary. Check primary and specialist sources before citing individual historical claims.