EJSS Fermat's principle refraction model

In optics, Fermat's principle or the principle of least time is the principle that the path taken between two points by a ray of light is the path that can be traversed in the least time.

EJSS Fermat's principle refraction model

http://weelookang.blogspot.sg/2015/07/ejss-fermats-principle-refraction-model.html
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author: Fu-Kwun Hwang, lookang, tina
author EJSS: author EJS: Francisco Esquembre

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