How does an adaptation where the ghost and hamlet are played by the same actor differ from an adaptation where the ghost and hamlet are played by two separate actors?
by having the same actor play both parts, the existence of the ghost is proven and hamlet’s madness is confirmed.
by having the same actor play both parts, the need for vengeance is emphasized and hamlet’s lack of madness is confirmed.
by having the same actor play both parts, the two characters are separated and hamlet’s lack of madness is confirmed.
by having the same actor play both parts, the two characters become one and hamlet’s madness is confirmed.

By having the same actor play both parts, the two characters become one and Hamlet’s madness is confirmed.

Explanation:

In Hamlet, Shakespeare explores the themes of revenge, deception, madness, betrayal and murder. Upon encountering his father's ghost, Prince Hamlet finds out that his father has been murdered, and decides to seek revenge on his uncle, Claudius.

In Act I, Scene V, Hamlet announces that he is going to put on an “antic disposition” - he is going to imitate a state of madness as a part of his revenge plot. As the play progresses, the line between acting and madness becomes almost invisible. Early in the play, other characters begin to notice that Hamlet's imagination is driving him crazy.

If one actor plays both Hamlet and the ghost, it indicates that the ghost does not exist and that Hamlet is really going crazy after his father's death. Hamlet's meeting with the ghost, in that case, has never happened - it was just a figment of his imagination.

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