如图所示空气中有一横截面为半圆环的均匀透明柱体其内圆半径为r外圆半径为rr=r现有一束单色光垂直于水平端面a射入透明柱体只经过两次 Template




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tomski如图所示空气中有一横截面为半圆环的均匀透明柱体其内圆半径为r外圆半径为rr=r现有一束单色光垂直于水平端面a射入透明柱体只经过两次 coloring