If a Thin Soap Film (N = 1 $\times$ 10^-7 M
B)6

Multiple Choice

If a thin soap film (n = 1.36) reflects predominately red light (about 680 nm) ,then what is the minimum thickness of the soap film?

A) 1.25 $\times$ 10^-7 m
B) 6.80 $\times$ 10^-7 m
C) 2.50 $\times$ 10^-7 m
D) 5.00 $\times$ 10^-7 m
E) None of these is correct.