Crossword Genius

Device used to invert an image (5)

Ross

I believe the answer is:

prism

(Other definitions for prism that I've seen before include "Transparent solid for dispersing light" , "Triangular piece of glass to deviate a beam" , "White light splitter" , "something that colours views?" , "Female character in The Importance of Being Earnest - optical device" .)

I've seen this clue in The Guardian.
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