Never heard of lighting a fire with a magnifying glass?
You get sunburns from UV light, not heat alone
https://www.sciencefocus.com/science/can-i-get-sunburnt-through-glass
Article states, accurately; "you can still get burned with long enough exposure".
COMM MOVED TO !historyphotos@piefed.social
Never heard of lighting a fire with a magnifying glass?
You get sunburns from UV light, not heat alone
https://www.sciencefocus.com/science/can-i-get-sunburnt-through-glass
Article states, accurately; "you can still get burned with long enough exposure".