| 摘要 |
PURPOSE: An angle distributed lens is provided to freely change the refractive index in response to the angle for the finite image which is obtained by a lens capable of changing Lagrangian invariant. CONSTITUTION: An angle distributed lens(30) is characterized in that it utilizes a device having a refractive index, wherein the refractive index is changed in response to the angle of the light beam inputted thereon. The device is selected from a group consisting of a material having a birefringence, a liquid crystal material or a material having a sub-wavelength grating.
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