Purpose of の in the sentence どこで見つけたのですか

I came across this sentence “どこで見つけたのですか” and I’m wondering if anyone can clarify the purpose of “の” here – is it supposed to be just emphasizing that we’re asking for an explanation, or is this tied to the verb and nominalizing it? Thanks for the help!

3 comments
  1. asking for an explanation.

    closest semantic equivalent in English is “where is it that you found it?”

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