No, the wavelength of light does not change when it passes through a double slit or any other medium. The wavelength of light is an inherent property of the electromagnetic wave itself and remains constant unless it interacts with a medium that causes a change, such as refraction or dispersion.
In the context of the double-slit experiment, which is a classic experiment in physics, a beam of light is passed through two narrow slits, creating an interference pattern on a screen placed behind the slits. The interference pattern arises due to the wave nature of light. When light passes through the slits, it diffracts, meaning it spreads out and interferes with itself.
The spacing between the slits and the characteristics of the light (such as its wavelength) determine the resulting interference pattern. The interference pattern can consist of bright and dark fringes, where the bright fringes are regions of constructive interference and the dark fringes are regions of destructive interference.
The double-slit experiment can be performed with light of different wavelengths, and the resulting interference pattern will vary accordingly. Light with shorter wavelengths, such as blue or violet light, will result in a pattern with narrower fringes, while light with longer wavelengths, such as red light, will produce a pattern with wider fringes.
It is important to note that while there are indeed numerous wavelengths of light that can be detected, the visible spectrum for humans ranges from approximately 400 to 700 nanometers. This range covers the colors from violet to red. Beyond the visible spectrum, there are other wavelengths of light, such as ultraviolet (UV) and infrared (IR), which cannot be directly perceived by the human eye but can be detected and measured using specialized equipment.