A Fresnel lens is basically a plastic magnifying glass. It is a good fire starter and the skill, the way you use the lens in bright sunshine, is something every survivalist and prepper should learn.
Just remember, if there are clouds or the sun is down you are out of luck. In other words, it should not be your main source of fire starting.
The video on the next page contains a quick demonstration of how to start a fire with a Fresnel lens. When the conditions are great this lens can be your best friend BUT there are things you need to know.
Go to the next page, watch closely, and make some mental notes about this informative video!