9.如图所示光从a点射入圆形玻璃经折射从b点射出.若射出玻璃与射入玻璃的光线夹角为30°ab弧所对的圆心角为120°下列说法中正确的是 Template


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tomski9.如图所示光从a点射入圆形玻璃经折射从b点射出.若射出玻璃与射入玻璃的光线夹角为30°ab弧所对的圆心角为120°下列说法中正确的是 coloring