View 1 of Fresnel Lens Large, 300x300mm, Focal Length 600mm, Acrylic Lens (not Glass), Olar Death ray for Physics Classroom, Magnifiying Sheet Fire Starter for Solar Heating, Solar Oven. (Focal Length 600mm)

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View 1 of Fresnel Lens Large, 300x300mm, Focal Length 600mm, Acrylic Lens (not Glass), Olar Death ray for Physics Classroom, Magnifiying Sheet Fire Starter for Solar Heating, Solar Oven. (Focal Length 600mm)View 2 of Fresnel Lens Large, 300x300mm, Focal Length 600mm, Acrylic Lens (not Glass), Olar Death ray for Physics Classroom, Magnifiying Sheet Fire Starter for Solar Heating, Solar Oven. (Focal Length 600mm)