用费马原理推导了透镜的物像公式.
评论了仅仅依据光速不变假设和相对性原理推导洛伦兹变换公式的方法。
The derivation methods of Lorentz transformation according to invariance of light speed and principle of relativity are commented.
并根据材料力学原理推导了光纤光栅波长漂移量与侧向位移的线性调谐关系。
Moreover, we deduce the linear relationship between reflected wavelength shift of fiber grating and vertical displacement of cantilever beam which the fiber grating is sticked on.
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