Any kind of motion where the same action is repeated over and over again counts as periodic motion. This includes circular motion, the swinging of a pendulum, Hooke’s Law motion (bouncing spring) and wave motion.
Category Archives: Waves
Thin Lens Equation – What’s plus, what’s minus?
(video) Any of the three quantities in the Thin Lens Equation can be either positive or negative, and remembering which is which is not so easy. But if you have a basic understanding of how lenses work, you can deduce what’s positive and negative…
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