本文采用几何光学模型，通过计算研究了光镊对油水界面上的球体微粒的捕获力。
The transverse trapping forces on a dielectric sphere located at an oil-water interface are theoretically investigated with the ray-optics model.
结果表明，在一般情况下，几何光学模型不能描述高斯光束经这种透镜的物像变换。
It is shown that the geometrical optics model can not be used to describe the object-image transformation of Gaussian beam through the lens under the general case.
利用近轴几何光学模型推导出焦距标度，这些焦距标度都具有良好的单调性和单峰性。
The focus measures are drived from the paraxial geometric optics model. All these focus measures have good monotonicity and unimodality.
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