Answer:
The figure of speech used in the sentence "The sun was shining on the sea, shining with all its might" is repetition of the verb "shining" is an example of anaphora. Anaphora is the repetition of a word or phrase at the beginning of consecutive clauses or sentences. In this case, the word "shining" is repeated at the beginning of two consecutive clauses, emphasizing the intensity of the sun's light on the sea.