Light: It’s all around us, but what is it? The universe is composed of stuff (matter) and light. Light, whether we’re bathed in it or in the dark, has many meanings for us. But what is light? Our class will talk about visible light and all the other radiations: radio and microwaves, infra-red, x- and gamma rays: where these radiations come from, their properties, how they act on the stuff in the universe including us. What happens when we get an x-ray, MRI, PET scan? We will talk most about visible light: how incandescent and led light bulbs and lasers work, why too much sun can be dangerous, and about nature’s wonderful light displays - the rainbow, butterfly wings, .... This class will be pitched to everyone - those with science backgrounds and those without. Lecture (plus Questions) Facilitated Discussion
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