| 摘要 |
Convex lenses(2,2') and concave lenses(3,3') are arranged adjacently to each other at the front of a telescope(1), and eye lenses(4,4') are mounted on the rear thereof. And prisms(5,5') are between the eye lenses and the convex lenses and concave lenses, to reflect the image of an object onto the eye lenses, making the incident width(L) of the image smaller(L2).
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