Give the solution of all part of following question
Question- A tanker has broken down and leaked oil (n = 1.20) into the ocean (n = 1.30), creating a large slick of thickness 450 nm.
Part A- You are looking straight down from an aeroplane, with the Sun directly overhead. What visible wavelength(s) is/are reflected most brightly due to constructive interference?
Part B- Later you are scuba diving under the same oil slick. Looking straight up, what visible wavelength(s) is/are transmitted most strongly?
Provide me the suitable answer of above question.