如图所示，用透明材料做成一长方体形的光学器材，要求从上表面射

如图所示，用透明材料做成一长方体形的光学器材，要求从上表面射入的光线可能从右侧面射出，那么所选的材料的折射率应满足

A．折射率必须大于

B．折射率必须小于

C．折射率可取大于1的任意值

D．无论折射率是多大都不可能

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如图所示，用透明材料做成一长方体形的光学器材，要求从上表面射

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