| 摘要 |
FIELD: instrument engineering. ^ SUBSTANCE: telescopic Galilei-type optical system consists of a lens system and an ocular. Lens system consists of two positive lenses, the first one of which is bonded of double convex and concave-shallow lenses, and the second one is double convex. Ocular is a single double concave lens. Dispersion factor for e line of ocular lens material can be more than 40 and less than 95. ^ EFFECT: increasing visible magnification, increasing diametre of entrance pupil and angle of vision in the area of objects, and improving image quality. ^ 2 cl, 1 dwg |
