a convex lens of power 4d is placed at a distance of 40cm

power 4dIn collaboration with HAPPY POWER. Only 300PCS Produced. Features: Full Size 36x18; Our Champion-Grade Speed + Control Surface; Soft Rubber AntiDurapower Group offers closed-loop, end-to-end Energy Storage Solutions for a variety of e-mobility, specialty, and stationary applications. Focusing on the manufacturing, research,