A Thin Layer of Oil (N = 1

Multiple Choice

A thin layer of oil (n = 1.25) is on top of a puddle of water (n = 1.33) .If normally incident 500-nm light is strongly reflected,what is the minimum nonzero thickness of the oil layer?

A) 200 nm
B) 250 nm
C) 100 nm
D) 400 nm
E) 150 nm