The literary technique used in the exchange between Paris and Juliet is that of dramatic irony. Dramatic irony is when the audience knows what is going on in the story but which the characters themselves don't seem to have any idea about it.
This scene in Act IV shows Juliet going to Friar Lawrence to tell him of the sad news of her impending marriage to Count Paris that had been moved nearer. But she encounters Paris with the Friar, discussing plans about the wedding. The conversation that takes place between them is a dramatic irony for we already know why she was here and why she was sad. But to Paris, the reason of her sadness and crying must have been because of the death of Tybalt. Contrary to that, we know that it was because of her stress and worrying about the rushed wedding of hers that has been pre-poned, and her inability to tell anyone of her already married status with Romeo to anyone. So, she has come to the Friar to ask for help and advice.And the fact that she behaved with Paris as if she is still planning to marry him shows a humorous but dramatic effect. She acts normal, saying that her declaration of love if done so, "<em>will be of more price, Being spoke behind your back, than to your face</em>".
