American Board of Opticianry (ABO) Practice Test

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What portion of light on the visible spectrum corresponds to the wavelengths 450 nm to 495 nm?

  1. Blue

  2. Red

  3. Green

  4. Violet

The correct answer is: Blue

Light on the visible spectrum with wavelengths ranging from 450 nm to 495 nm corresponds to the color blue. Different colors in the visible spectrum are determined by the range of wavelengths they encompass. In this case, the range falls within the blue region, hence the correct answer is A. The other options (Red, Green, Violet) are not correct as they correspond to different ranges of wavelengths on the visible spectrum.

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