Which of the following is considered a safe practice when working with lasers?

Using beam barriers to contain the laser light is a considered safe practice when working with lasers because it effectively limits the exposure of laser radiation to unintended areas and personnel. Beam barriers, which can be made from materials specifically designed to absorb or reflect laser energy, help to ensure that the laser beam is confined to a designated area, reducing the risk of accidental exposure to eyes and skin.

This practice is essential in maintaining a safe working environment, as it prevents the hazardous effects of laser beams from affecting individuals who are not engaged in the operation of the laser. Properly installed barrier systems can provide an additional layer of safety by creating physical obstacles that prevent stray beams from escaping the controlled area, thereby aligning with established laser safety protocols.

Other options, while they may seem feasible in certain contexts, do not meet safety standards. For example, positioning mirrors requires careful consideration of the beam path, and adjusting lasers without proper training can lead to dangerous situations. Additionally, looking directly into a laser beam is inherently unsafe and poses a significant risk of eye damage.