Based on the conservation of photon momentum component parallel to the interface, the demonstration device of refractionlaw of light is made.
基于光子动量在不同媒质分界面上沿分界面方向守恒原理，制作了光的折射(定)律演示装置。
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The expression of aspheric surface is obtained by solving numerically equations based on law of conservation of energy and refractionlaw by mathematical software.
This paper, based on the straight-line transmitting law and refractionlaw of light, analysed the conditions that the image of object in water will be clearly observed.