Answer:
Mystery and interest.
Step-by-step explanation:
In this excerpt, we see Gatsby stretching his arms and reaching towards the green light that is found at the end of a dock. He is staring at the dark water, on his own, in a curious way. Moreover, he is trembling. All of these images create a feeling of mystery. They also create interest, as it makes the reader curious to know the reason why Gatsby behaves in such an unusual way.