後焦点面

back focal plane

[目次：レンズ系]

レンズをはさんで物体と反対側にある焦点面。回折図形が形成される面、すなわち試料の逆空間に対応する面。

A focal plane located in the opposite side of the object (plane) with respect to a lens is called the back focal plane. A diffraction pattern is formed on the "back focal plane," thus the plane corresponds to the reciprocal space of the specimen.

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