FIELD: optical instruments. SUBSTANCE: device is made from material with radial gradient of refraction index n(y). Its ray path period length is L. Equation of ray path in lens material is V1(Z). First front surface is flat. Second surface is convex which generatrix depends on above-mentioned equation. EFFECT: design of telescopic gradient lens which magnification is not equal to +-1, decreased lens thickness. 2 dwg
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