A light ray traveling in air with refractive index \(n_0 = 1\) is incident at a small angle \(\theta_0\) relative to the normal onto two stacked, parallel transparent slabs. The top slab has thickness \(d_1\) and index of refraction \(n_1\), and the bottom slab has thickness \(d_2\) and index of refraction \(n_2\). After passing through both slabs, the ray emerges back into air parallel to its original path but shifted laterally by a distance \(\Delta x\). Which of the following expressions is a correct approximation for the total lateral displacement \(\Delta x\) of the emerging ray?