Which wavelength of light is least likely to be absorbed by the cornea or lens?

The wavelength of light that is least likely to be absorbed by the cornea or lens is 450 nm. This light falls within the visible spectrum, specifically in the blue region, which the cornea and lens are relatively transparent to.

The cornea primarily absorbs ultraviolet (UV) light to protect the internal structures of the eye, with significant absorption occurring at wavelengths below 300 nm. At 250 nm and 300 nm, there is considerable absorption due to the cornea's protective mechanisms against harmful radiation. As the wavelength increases beyond 300 nm, the absorption decreases, making the cornea and lens more transparent to longer wavelengths.

At 350 nm, there is still some absorption as it is on the edge of UV light. However, at 450 nm, the absorption is minimal, allowing more light to pass through without being absorbed. This increased transparency at this wavelength is a protective adaptation, enhancing visual function by allowing the most visible light to reach the retina effectively.