H31-341_V2.5 · Question #959
The CLASS 1M mark on the optical module indicates that the luminous power is low and will not cause damage to eyes or skin.
The correct answer is B. False. B is correct because CLASS 1M does not simply mean "low power and harmless." CLASS 1M lasers are safe for naked-eye viewing under normal conditions, but the "M" (for Magnification) specifically warns that viewing through optical instruments - such as magnifying lenses…
Question
The CLASS 1M mark on the optical module indicates that the luminous power is low and will not cause damage to eyes or skin.
Options
- ATrue
- BFalse
How the community answered
(27 responses)- A30% (8)
- B70% (19)
Explanation
B is correct because CLASS 1M does not simply mean "low power and harmless." CLASS 1M lasers are safe for naked-eye viewing under normal conditions, but the "M" (for Magnification) specifically warns that viewing through optical instruments - such as magnifying lenses, binoculars, or microscopes - can concentrate the beam and cause serious eye injury.
Option A is wrong because it mischaracterizes CLASS 1M as universally safe. The classification only guarantees safety for unaided viewing; it does not rule out potential harm in all scenarios.
Memory tip: Think of the "M" in CLASS 1M as a warning for Magnification. If you use anything that magnifies or focuses light from a CLASS 1M source, you risk eye damage - so the statement that it "will not cause damage" is never fully true.
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