Which type of radiation is detected by the human eye?

The human eye is specifically adapted to detect visible light, which is a range of electromagnetic radiation that falls within the wavelengths of approximately 380 to 750 nanometers. This range is what we perceive as colors, from violet through to red. The structures in our eyes, including the retina and photoreceptor cells (cones and rods), are sensitive to these wavelengths, allowing us to see the world around us in color and light.

Ultraviolet waves, while they exist beyond the visible spectrum, are not visible to the human eye and can only be detected by specialized instruments. Similarly, X-rays and gamma rays are higher energy forms of radiation that are well beyond the visible spectrum and are also undetectable by human vision. Hence, the only type of radiation among the options that the human eye can detect is visible light.