Describe Shakespeare's dark and light imagery throughout all 5 acts.

Gradesaver's summaries and analysis for each of the acts contains all of the refernces you need in regard to both light and dark imagery. I have provided the direct link to Act I below. You need only read through the analysis for each scene in order to compile the necessary information.

http://www.gradesaver.com/othello/study-guide/summary-act-i