No, it is not possible to decrease the wavelength of a radio or infrared (IR) wave to the point where it becomes visible light. Each type of electromagnetic radiation has its own specific wavelength range, and these ranges do not overlap. Visible light has wavelengths ranging from approximately 400 to 700 nanometers, while radio waves have much longer wavelengths, typically ranging from meters to kilometers. Similarly, infrared radiation has wavelengths longer than visible light, typically ranging from around 700 nanometers to 1 millimeter.
While it is possible to convert electromagnetic radiation from one form to another using specialized devices, such as converters or detectors, this process typically involves more than just adjusting the wavelength. It often requires the use of specific materials or technologies designed for that purpose.