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A beam of linearly polarized light strikes a calcite crystal

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A beam of linearly polarized light strikes a calcite crystal,the direction of the electric vector making an angle of 60º with the optic axis.
(A)What is the ratio of the amplitude of the refracted beams?
(B)What is the radio of their intensities?
(A)1/根号3(B)1/3
A beam of linearly polarized light strikes a calcite crystal
一束线偏振光在方解石晶体的光轴,使电矢量的60º角度方向.
对折射光的振幅的比率是多少?tan60=根号3
其强度是多少
再问: 我需要的是怎么算的,不是翻译