Question

When a soap film gets *very* thin, down to a molecular lengths scale, its reflection across the entire visible spectrum becomes zero. Why? Explain. Why is it not the other two answers?

a.	It is too thin to reflect light.

b. Reflections from the front and back surface are out of phase, and there is essentially no path difference.

c. The molecular length scale is about 1/4 of optical wavelengths, resulting in destructive interference.

Answer 1