A 360-Nm Thick Oil Film Floats on the Surface of a Pool

Multiple Choice

A 360-nm thick oil film floats on the surface of a pool of water.The indices of refraction of the oil and the water are 1.50 and 1.33,respectively.When the surface of the oil is illuminated from above at normal incidence with white light,what is the wavelength of light between 400 nm to 800 nm wavelength that is most weakly reflected?

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