How a Fresnel Lens works, using a simple blackboard model.
David shows the construction of a Fresnel Lens, using magnetic sheet on a blackboard
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![Змей [ КЛИП 2024 ]](https://sun9-70.userapi.com/3BbBGMslpqCZ-V0ra7T3EkA31s6W_ApACOpdkw/x9WIe3psfEI.jpg)
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