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Should I say "I've watched the film in 3D" or "I've watched the film on 3D"?

2 Answers 2

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The former ( in 3D)

Here's a straightforward example from Longman :"a film in 3-D"

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3D means three dimensions. Something cannot be seen on those dimensions, but can be seen in them. Had the phrase been '3D t.v.', then it could be seen on a 3D t.v. No mention of that in the question though...

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