要使一束线偏振光通过偏振片之后振动方向转过90° 则这束光___ To make a beam of linearly polar
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要使一束线偏振光通过偏振片之后振动方向转过90°，则这束光___ To make a beam of linearly polarized light pass through the polarizer and turn the direction of vibration 90 °, the beam___
A．至少需要通过1块理想的偏振片，此时透射光强最大是原来光强的1/2倍； At least one ideal polarizer is needed, and the maximum transmitted light intensity is 1 / 2 of the original one;
B．至少需要通过2块理想的偏振片，此时透射光强最大是原来光强的1/4倍； At least 2 ideal polarizer is needed, and the maximum transmitted light intensity is 1 / 4 of the original one;
C．至少需要通过3块理想的偏振片，此时透射光强最大是原来光强的27/64倍； At least 3 ideal polarizer is needed, and the maximum transmitted light intensity is 27/64 of t
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