In our discussion of thin-film interference, we looked at light reflecting from a thin film. What If? Consider one light ray, the direct ray, which transmits through the film without reflecting. Consider a second ray, the reflected ray that transmits through the first surface, reflects from the second, reflects again from the first, and then transmits out into the air, parallel to the direct ray. For normal incidence how thick must the film be, in terms of the wavelength of light, for the outgoing rays to interfere destructively? Is it the same thickness as for reflected destructive interference?