imgyegak
critical angle
angle critique ; angle décisif
빛이 물과 공기의 경계에서 임계각을 초과하면 전반사가 발생한다.
bichi mulgwa gong-ui gyeonggyeeseo imgaegageul chogahamnida.
When light exceeds the critical angle at the boundary between water and air, total internal reflection occurs.
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