20.半径为r的半圆形玻璃砖截面如图所示o为圆心光线甲沿半径ao方�射入恰好在o点�生全反射另一条平行于甲的光线乙从最高点射入玻璃砖 Template




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tomski20.半径为r的半圆形玻璃砖截面如图所示o为圆心光线甲沿半径ao方�射入恰好在o点�生全反射另一条平行于甲的光线乙从最高点射入玻璃砖 coloring