Final answer:
The purpose of the oxymoron and paradox used in the excerpt from Romeo and Juliet is to emphasize a point about love.
Step-by-step explanation:
The purpose of the oxymoron and paradox used in the excerpt from Act II, scene vi of Romeo and Juliet is to emphasize a point about love. The oxymoron and paradox help to convey the contradictory and complex nature of love. For example, the line 'That strain again, it had a dying fall' contains a paradox, as it combines the concepts of sound and death to illustrate the bittersweet nature of love. Furthermore, the oxymoron 'sweet south' creates a contradictory image, emphasizing the complex and powerful emotions associated with love.