[单选题]
05.43: Light is incident normal to a mwhzrlhzr3/0kvu60g d 74h6 zthin y3fu+kh c:htfh:6a 1player of soap. Given the figure, what is the minimum thickness of the soap film that gives the soap a b3 a:h 6+hft:1yhfkcpu luish color ($\lambda$ = 500 nm)?
