Answer :
Final answer:
The shade numbers commonly used in oxyacetylene welding goggles are 10, 11, and 12. Higher numbers indicate darker lenses.
Explanation:
The numbers commonly used in oxyacetylene welding goggles refer to the shade level of the lenses. These numbers correspond to the darkness of the lens and help protect the welder's eyes from the brightness and harmful UV radiation produced during welding. In this case, shades 10, 11, and 12 are commonly used in oxyacetylene welding goggles. Higher numbers indicate darker lenses, providing more protection.
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