The lens are one optical element lens which by the transparent material (for example glass, quartz and so on) is made compose the microscope optical system's most basic optical element. The lens are one kind the optical fiber polymerization or the dispersion equipment, usually is constitutes by glass, the ordinariest lens are the spherical lens, the superficial radian are the spherical surface curvature, is also in front of the lens and the following surface respectively is a sphere surface part. Each surface may be the convex (from lens bulge, the concave (enters lens hollowly) outward) perhaps the plane (smooth). Around the lens the superficial spherical surface central point's segment is called lens' optical axis, under all conditions, lens' optical axis will adopt in lens' physics center nearly.
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