Situation 17.1 A 360 Nm Thick Oil Film Floats on the Surface

Situation 17.1
A 360 nm thick oil film floats on the surface of the water.The indices of refraction of the oil and the water are 1.50 and 1.33,respectively.The surface of the oil is illuminated from above at normal incidence with white light.
-In Situation 17.1,the wavelength of light in the 400 nm to 800 nm wavelength band that is most weakly reflected,in nm,is closest to:

A) 520
B) 540
C) 560
D) 580
E) 600