The terms gradient index (GRIN) or graded index (GI) are often used to describe an inhomogeneous medium in which the refractive index varies from point to point.
梯度折射率或变折射率通常被用于描述非均匀介质，其折射率为点对点的变化。
The terms gradient index (GRIN) or graded index (GI) are often used to describe an inhomogeneous medium in which the refractive index varies from point to point.
梯度折射率或变折射率通常被用于描述非均匀介质，其折射率为点对点的变化。
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