如图所示横截面为矩形的粗细均匀的玻璃棒被弯成半圆形状其内半径为r玻璃棒横截面宽为d如果一束平行光垂直于玻璃棒的水平端面a射入并使其 Template




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tomski如图所示横截面为矩形的粗细均匀的玻璃棒被弯成半圆形状其内半径为r玻璃棒横截面宽为d如果一束平行光垂直于玻璃棒的水平端面a射入并使其 coloring