this post was submitted on 25 Jan 2026
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Explain Like I'm Five

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[โ€“] Lumidaub@feddit.org 9 points 2 weeks ago (1 children)

Both eye glasses and magnifying glasses can be used to start a fire but both also take a bit to do so and have to be held in the exact right angle.

[โ€“] adespoton@lemmy.ca 2 points 2 weeks ago

Right angle and focal distance. Eyeglasses sit such that the focal point concentrated enough to start a fire is a focal point further away than the back of your retina. But it can still cause permanent sunburn/vision loss.