Final answer:
Safety standards for gas cutting often recommend a lens shading of 9 or higher to protect the eyes from intense light and UV radiation emitted during the cutting process.
Step-by-step explanation:
To determine the correct lens shading for gas cutting, it is important to consider the level of protection required against the intensity of light produced by the cutting process. When performing gas cutting, where the brightness of the flame can be intense, safety standards often call for a lens shading of 9 or higher. This is to ensure that the eyes are protected from the bright light and potential UV radiation emitted during cutting. It's not about having multiple data points or determining the angle of the beam in the gas; it's about offering sufficient eye protection while performing this type of work.