Which statement describes Class 3B lasers?

Which statement describes Class 3B lasers?

• A. They are safe under all conditions
• B. They are potentially hazardous under any viewing conditions and may present skin hazards if focused and stable
• C. They pose no skin hazard
• D. They are invisible

Answer: (B)

Class 3B lasers carry significant hazard because their beam can cause serious eye injury with direct viewing, and they can burn skin if the beam is concentrated and held on one spot. The eye safety concern is not something you can ignore or rely on diffuse viewing to be safe; any direct exposure to the beam is potentially dangerous, which is why proper controls, warnings, and protective equipment are essential when a Class 3B laser is in use. At the same time, the beam’s power can create skin burns if it is focused and stable on a small area, especially with higher-power 3B devices. This combination of direct-eye hazard and possible skin burns is what makes the statement describing Class 3B lasers most accurate. The other options imply universal safety, no skin hazard, or invisibility, which do not align with the true risk profile of Class 3B lasers.

Class 3B lasers carry significant hazard because their beam can cause serious eye injury with direct viewing, and they can burn skin if the beam is concentrated and held on one spot. The eye safety concern is not something you can ignore or rely on diffuse viewing to be safe; any direct exposure to the beam is potentially dangerous, which is why proper controls, warnings, and protective equipment are essential when a Class 3B laser is in use. At the same time, the beam’s power can create skin burns if it is focused and stable on a small area, especially with higher-power 3B devices. This combination of direct-eye hazard and possible skin burns is what makes the statement describing Class 3B lasers most accurate. The other options imply universal safety, no skin hazard, or invisibility, which do not align with the true risk profile of Class 3B lasers.