Mosquitos are always landing up on the ceiling, you could just mount it above eye level with hard stops preventing it from pointing down, make sure you don’t have shiny ceiling things, and it’s safeish :P
When light encounters a surface, a certain amount of it is absorbed, some may pass through the material, and the rest reflects. All of those functions are variable with wavelength- a material that is opaque to visible light may be transparent to other forms of radiation, like radio waves. This is actually where our perception of color comes from- it is the wavelengths of light that weren’t absorbed by and didn’t pass through the surface we’re looking at. (Sorry, I’m a nerd about this sort of stuff)
A laser is extremely concentrated light. Most materials can only absorb a certain amount of that energy. As such, a lot more of it reflects back off the opaque surfaces it encounters, even if they aren’t mirrors. For a strong enough laser, even that weakend reflection can do damage.
Mosquitos are always landing up on the ceiling, you could just mount it above eye level with hard stops preventing it from pointing down, make sure you don’t have shiny ceiling things, and it’s safeish :P
When light encounters a surface, a certain amount of it is absorbed, some may pass through the material, and the rest reflects. All of those functions are variable with wavelength- a material that is opaque to visible light may be transparent to other forms of radiation, like radio waves. This is actually where our perception of color comes from- it is the wavelengths of light that weren’t absorbed by and didn’t pass through the surface we’re looking at. (Sorry, I’m a nerd about this sort of stuff)
A laser is extremely concentrated light. Most materials can only absorb a certain amount of that energy. As such, a lot more of it reflects back off the opaque surfaces it encounters, even if they aren’t mirrors. For a strong enough laser, even that weakend reflection can do damage.