Based on the conservation of photon momentum component parallel to the interface, the demonstration device of refraction law 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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Shield material with some certain composition can absorb a large part of low energy photon of X-ray and reduce the radiation effect on electronic component.

采用一定组分的材料对X射线进行辐射屏蔽，可以吸收大部分的低能光子，减少X射线对电子系统的辐射损伤。

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