Washington Esthetician State Board Practice Exam

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Within the visible spectrum of light, which color has the longest wavelength?

  1. Blue

  2. Green

  3. Red

  4. Yellow

The correct answer is: Red

The color red has the longest wavelength within the visible spectrum of light. The visible spectrum ranges from approximately 380 nanometers (violet) to about 750 nanometers (red). As wavelengths increase, the colors transition from violet to blue, green, yellow, and finally to red. This order reveals that red occupies the upper range of the visible light spectrum, making it distinct. Understanding this aspect of light is crucial for estheticians, as different wavelengths can penetrate the skin to varying depths and affect skin treatments, including light therapies and laser treatments.

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