Answer:
Appearance and reality
Step-by-step explanation:
The theme plays an exponential role in the whole play. For instance, the ghost which appears in the apparition from hell is an example of the issue it happens amid reality which is the revelation of hamlet. The spirit then informs hamlet that his father was killed through murder.
However, Hamlet did not believe that and doubted the sincerity of the revelations of the ghost. He then pretends to put the appearance of being made to extract the truth of the statement.