Ace the 2026 PSI Barbering Exam – Snip, Style, and Success Awaits!

The option indicating ultraviolet light is correct because ultraviolet (UV) light exists just beyond the visible spectrum and has wavelengths shorter than visible light. The visible spectrum ranges from approximately 380 nm to 750 nm, with violet light having the shortest wavelength within that range. Ultraviolet light falls below 380 nm, making it the type of light with the shortest wavelength when compared to any visible colors like red, green, or blue light.

Red light has the longest wavelength within the visible spectrum, followed by green and then blue light, which are all longer than that of ultraviolet. Thus, ultraviolet is indeed the light type that possesses the shortest wavelength.