Can laser light be visible and invisible?

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Study for the 40Hr Laser Hair Removal Apprentice Test. Learn with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Can laser light be visible and invisible?

Explanation:
Laser light can be visible or invisible because visibility depends on wavelength. The human eye sees light roughly from 380 to 740 nanometers. Wavelengths in that range are visible (for example, a 532 nm green beam). Wavelengths outside that range, such as in the near- to mid-infrared (about 800–1000+ nm), are invisible to the eye. In hair removal, the treatment beam is often infrared and not visible, though devices may have a separate visible aiming beam. So laser light can be visible or invisible depending on the wavelength.

Laser light can be visible or invisible because visibility depends on wavelength. The human eye sees light roughly from 380 to 740 nanometers. Wavelengths in that range are visible (for example, a 532 nm green beam). Wavelengths outside that range, such as in the near- to mid-infrared (about 800–1000+ nm), are invisible to the eye. In hair removal, the treatment beam is often infrared and not visible, though devices may have a separate visible aiming beam. So laser light can be visible or invisible depending on the wavelength.

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