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TOEFL BNC: 25451 COCA: 24651

the fact of light or sound being caused to change direction or to separate when it travels through water, glass, etc. 折射

absolute index of refraction

a calculation of the relationship between the speed of light moving through a medium (= substance) and the speed of light in a vacuum (= an area with no matter in it)绝对折射率

angle of refraction

the angle that a beam of light or other energy that is refracted by a surface makes with a line vertical to that surface折射角


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