Final answer:
The dramatic irony in Act 1 of Julius Caesar is seen in Brutus' true intentions.
Step-by-step explanation:
The dramatic irony in Act 1 of Julius Caesar can be seen in Brutus' true intentions. Brutus is portrayed as a loyal friend to Caesar, but the audience knows that he is actually part of the conspiracy to assassinate Caesar. This creates dramatic tension as the audience is aware of the impending betrayal while Caesar remains oblivious.