Precision crafted lens has approximately 50 lines per inch.
Lens is approx. 11" square and is 1/16" thick. Unmounted. Instructions included to build a 360° stand and frame (frame not included).
Frame allows you to use lens as a solar cooker for heating prepared foods, or for other solar experiments.
!!Caution!! A fresnel lens generates high temperatures when used under direct sunlight. Parent or teacher supervision required for educational demonstrations. Make learning safe!