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deflection. n. 1. the act of deflecting or the state of being deflected. 2. the amount of deviation. 3. (General Physics) the change in direction of a light beam as it crosses a boundary between two media with different refractive indexes.
It may refer to an angle or a distance. The deflection distance of a member under a load is directly related to the slope of the deflected shape of the member under that load and can be calculated by integrating the function that mathematically describes the slope of the member under that load.he deflection of beam elements is usually calculated on the basis of the EulerâBernoulli beam equation while that of a plate or shell element is calculated using plate or shell theory. An example of the use of deflection in this context is in building construction.