Fresnel Reflector

The UK has been bathed in sunshine for the last 2 days so I've taken a a bit of interest in reflectors of one kind or another in an effort to create fire (and ultimately as a way to potentially warm up our new bathroom with a solar heater). I started with this Fresnel reflector, the idea of a flat item is quite appealing. A calculator to work out the angles and sizes is available from here. After I assembled the prototype though it really doesn't look like a lot of reflective surfaces so I decided to move on to the next design.