Which statement about the visible spectrum is true?

• A. The visible spectrum is not detectable by humans.
• B. The visible spectrum is the portion detectable by humans, spanning colors from red to violet.
• C. The visible spectrum includes ultraviolet waves.
• D. The visible spectrum has no fixed color order.

Answer: (B)

Light visible to our eyes is a specific portion of the electromagnetic spectrum—the wavelengths our eyes can interpret as color. This range runs from red, with the longest wavelengths, to violet, with the shortest. In this window we see colors in the familiar order: red, orange, yellow, green, blue, indigo, violet. Ultraviolet light lies beyond violet and is not visible, and infrared lies beyond red and is also not seen. So the true statement is that the visible spectrum is the portion detectable by humans, spanning colors from red to violet. The idea that it isn’t detectable or that it includes ultraviolet contradicts how our vision works, and the colors have a fixed order by wavelength.