The branch of science concerned with the properties and phenomena of light (distinguished from optics when that term is used in relation to sight). Formerly also: (collective plural) †devices and apparatus for providing illumination (obsolete).

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Connections NYT: Hints For Today's Puzzle, Tue, Jan 13

NYT Strands Today - Hints, Spangram & Answers for January 13

Today’s Wordle Answer Jan 13 #1669- NYT Wordle Hints & Updates

Today's NYT Pips Hints & Answers

Today's NYT Capture Hints & Answers

NYT Mini Crossword Answers Today - The Mini for Jan 13 Solved