Simulate reflection and refraction of light.
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https://ricktu288.github.io/ray-optics/
▶Simulate various light sources: ray, beam, and point source
▶Simulate reflection in plane or arc mirror
▶Simulate refraction in plane or arc interfaces, including both refracted and reflected rays
▶Simulate ideal lens/mirror, which obeys lens/mirror equation
▶View extensions of rays to see if they converge to a virtual image
▶View real images, virtual images and virtual objects directly
▶View images that can be observed from some given position
▶Distance and angular measurement