Final answer:
The correct answer for the minimum recommended shade lens for MIG welding is Shade 12, essential for eye protection.
Step-by-step explanation:
The minimum recommended shade lens for MIG welding, according to safety guidelines, is Shade 12. Using a welding lens with sufficient shading is critical for protecting one’s eyes from the intense light and radiation that welding generates. MIG welding generally requires a higher shade lens compared to other types of welding due to the higher levels of light and radiation emitted.