Fresnel Lens, Diameter 400mm, Focal Length 240mm, Acrylic Lens (not Glass), for Physics Classroom, Solar Heating, Magnifiying.

Fresnel Lens Large, Diameter 400mm(15.74"), Focal Length 240mm(9.44"), Solar Death ray for Physics Classroom, Magnifiying Sheet Fire Starter for Solar Heating, Solar Oven, Acrylic Lens (not Glass)

8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier -- Solar Oven/DIY Projection TV PLANS (1 pack PREMIUM GRADE Large Lens)

Fresnel Lens, 200x200mm, Focal Length 100mm, Acrylic Lens (not Glass), for Physics Classroom, Solar Heating, Magnifiying. (Focal Length 100mm)