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【黑龙江省哈尔滨市第六中学2016届高三下学期第二次模拟】如图所示,一束截面为圆形(半径为)的平行紫光垂直射向一半径也为R.的玻璃半球的平面,经折射后在屏幕S.上形成一个圆形亮区,屏幕S.至球心距离为...

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