Final answer:
To include thickness in the double slit experiment, consider the diffraction effects and use extended theoretical models or computational simulations to account for changes in the interference patterns.
Step-by-step explanation:
Adding thickness to the equation in the double slit experiment involves considering the diffraction effect along with interference. If the slits are comparable to or wider than the wavelength of light used, then diffraction cannot be ignored. Indeed, the thickness or width of the slits changes the pattern seen on the screen due to diffraction overlapping with interference. The more significant this diffraction effect, the more the interference fringes can be altered; especially if one of the slits is covered with a thin film, the phase change induced by the film alters the interference pattern. In a practical setup, such as mentioned in 'EXAMPLE 6.15', the slit dimensions are crucial to accurately predicting the interference patterns of electron waves.
To account for diffraction, one could potentially use extended versions of the Huygens-Fresnel principle or computational modeling solutions that incorporate slit width and material properties.The double slit experiment is focused on interference patterns caused by two slits, typically assuming that the slits are narrow enough to ignore diffraction effects. However, if you want to incorporate the thickness of the wall into the equation, you would need to consider the diffraction effect of each slit. The diffraction will cause the light waves passing through each slit to spread out and interfere with each other, leading to a broader interference pattern on the screen. The thickness of the wall would determine how much diffraction occurs and affects the interference pattern.