Final answer:
The optimal part of Weston's spectrum for color vision falls between 400 nm and 750 nm, corresponding to the visible range of light that the human eye can perceive and is sensitive to, with specific colors associated with certain wavelengths.
Step-by-step explanation:
The optimal part of Weston's spectrum for color vision is the range from 400 nm to 750 nm, with human vision being most sensitive to wavelengths that correspond to the colors our cones process: red, orange, yellow, green, blue, indigo, and violet. Visible light is part of the electromagnetic spectrum, with wavelengths that our eyes can detect and process. The retina contains photoreceptors called cones that are responsive to specific wavelengths, making them crucial for color perception.
These color-sensitive cones have peak sensitivities at different points within the visible spectrum. In essence, optimal color perception occurs when the light falls within this range of wavelengths, and each color corresponds to a specific wavelength, such as red at roughly 700 nm, orange at 600 nm, and so on, with violet at 425 nm.