What is the generally understood wavelength range of visible light?

The generally understood wavelength range of visible light spans from approximately 390 to 750 nanometers. This range is significant because it encompasses the light that can be detected by the human eye, allowing us to see colors. Within this spectrum, different wavelengths correspond to different colors; for instance, wavelengths around 400 nanometers appear violet, while those closer to 700 nanometers appear red.

This range effectively captures the visible spectrum, which is critical in fields such as physics, photography, and various types of visual arts. The choice of 390 to 750 nanometers is widely recognized and utilized in scientific research, making it the most accurate answer.