| 摘要 |
The monocular device comprises an elongate body in two parts 2, 3, at one end of which a viewer 1 is fixed. At its other end, this body comprises, on the inside, two biconvex lenses 4, 4' of equal power arranged inside throats 5, 5'. The distance A between the first lens 4 and the second lens 4', and the distance B between the second lens 4' and the viewer 1 corresponds to a ratio A = 1/4 B, approximately. The device, which provides high magnification, applies particularly to the observation of insects in agriculture. <IMAGE>
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