타원에서의 빛 반사(Reflection of Light on a Ellipse)
타원에서의 빛 반사(Reflection of Light on a Ellipse) : https://goo.gl/eQG9hs gif : https://goo.gl/NDfb31 YouTube : https://youtu.be/Ahi2XZBSY7A
수학자료실 강의실 : https://goo.gl/czyJLW YouTube Channel : https://goo.gl/JpzU5i twitter : https://twitter.com/mineungi