| 摘要 |
1. Optical system composed of a lens characterised in that it contains at least one lens whose both radiuses of curvature are identical and equal to (R) and the maximum thickness of the lens (H) is strictly determined and equal to the ratio of the radius of curvature of the lens (R) and the value of the index of refraction (n) of the material the lens is made from.<IMAGE>
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