Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength(s) of the following can make visual sensation to a human eye?

The human eye is sensitive to a very narrow range of the electromagnetic spectrum known as visible light. This range is typically defined as having wavelengths between approximately 400 nm and 700 nm. Radiations with wavelengths shorter than 400 nm, such as 200 nm, fall into the ultraviolet (UV) category. These shorter wavelengths are largely absorbed by the cornea and lens to protect the retina, making them invisible to the human eye. Conversely, radiations with wavelengths longer than 700 nm, such as 1000 nm, fall into the infrared (IR) range. While infrared light can enter the eye, the human eye cannot normally perceive it as brightness. Therefore, among the given options, only the 500 nm wavelength falls within the visible spectrum (400–700 nm) and can produce a visual sensation.