What Is the Minimum (Non-Zero) Thickness of a Benzene (N $\lambda$

Multiple Choice

What is the minimum (non-zero) thickness of a benzene (n = 1.501) thin film that will result in constructive interference when viewed at normal incidence and illuminated with orange light ( $\lambda$ _vacuum = 615 nm) ? A glass slide (n_g = 1.620) supports the thin film.

A) 51.0 nm
B) 306 nm
C) 204 nm
D) 102 nm
E) 76.0 nm