| 摘要 |
A wide-field binocular eyepiece preferably for use with a flat image display system. The eyepiece includes a biconvex thick lens having concentric spherical lens surfaces whose radii are selected to satisfy the aplanatic condition. To minimize chromatic aberration, the biconvex thick lens may be formed of a plurality of cemented elements having indices which are close to each other but having respective different dispersions.
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