Crossword Genius

Optical element (4)

Ross

I believe the answer is:

lens

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">optical element</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for lens that I've seen before include "French city" , "Piece of glass, usually curved" , "Transparent optical device" , "Optical element" , "Light-focusing device" .)

I've seen this clue in the Newsday.com and The Times.
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