There&#x27;s a lot of videos on YouTube of people using Fresnel lenses from old projection TV&#x27;s and melting various things.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=jrje73EyKag" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=jrje73EyKag</a>