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• Refraction and Snell's law | Geometric optics | Physics | Khan Academy 굴절 망원경 refracting telescope 굴절각 angle of refraction, refraction angle 굴절곁수 refraction coefficient 굴절계 refractometer 굴절 광선 refracted ray 굴절날 refracting edge 굴절도 refractivity 굴절률 refractive index 굴절망원경 refracting blog.naver.com · 2025.08.18