Fresnel Mirrors can be made with different techniques. This is the simples way to make a Fresnel Mirror. The beam concentrates to a 2 inch diameter which is good for boiling water. The center is filled with the flat cut away circle not shown in this video
![DIY VANITY MIRROR WITH LIGHTS [UNDER $100!!!] || SimplySandra](https://cdn.mycrafts.com/i/1/6/11/diy-vanity-mirror-with-lights-g7FP-m.jpg)
