In relation to Class 3B lasers, what is not hazardous and does not cause damage?

• A. A concentrated beam
• B. A reflected diffused beam
• C. A pulsed beam
• D. An expanded beam

Answer: (B)

The correct choice identifies a reflected diffused beam as not hazardous and not causing damage. A reflected diffused beam means that the light from the laser is scattered in different directions, which significantly reduces its intensity. This scattering minimizes the risk of harm to eyes or skin because the energy is spread out over a larger area, making it less potent than a concentrated beam.

In contrast, a concentrated beam poses risks as it can focus directly on a surface or object, leading to potential burns or eye damage. A pulsed beam can also be hazardous as it may deliver bursts of energy that can be damaging. An expanded beam, while it might reduce intensity compared to a focused beam, can still lead to hazards depending on the power and application of the laser. Thus, the reflected diffused beam stands out as the safest option in relation to Class 3B lasers.