What item serves as the ocular proof for Othello and who brought it to his attention?

Othello witnesses Bianca's arrival with the handkerchief. All of this presents the “ocular proof” so desired by Othello

Explanation:

In response to Iago's insinuations about Desdemona's adultery, Othello demands “ocular proof”—that is, evidence that will visually verify the allegation against his wife. Othello's emphasis on the need for Iago to “prove [his] love a who=re” demonstrates his commitment to justice.

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