The wavelength of light can be described using the electromagnetic spectrum. The specific wavelengths of red and blue light vary depending on the precise definition used, but here are approximate values:
Red light is generally associated with wavelengths between approximately 620 to 750 nanometers (nm).
Blue light is typically associated with wavelengths between approximately 450 to 495 nm.
It's important to note that these values are approximate and can vary slightly depending on the context or specific definitions used. The electromagnetic spectrum encompasses a wide range of wavelengths, with visible light representing a small portion of that spectrum.