该上、下壁互相配合而形成一水平准直狭缝，以确保光源发出的光不在磁带上方或下方反射而引起位于磁带盒外的光检测器的误读。
The lower and upper walls match mutually to form a horizontal slit, which preven the light from being reflected by the tape and prevent the misreading of optical detector outside the cassette.
然而，一般来说，光从光源通过这两个狭缝传到屏幕上的距离是不同的。
However, in general, the distance the light has to travel from the source to the screen via the two slits will be different.
在假定照明光源是均匀分布的小圆形光源和狭缝为一矩形的条件下，分别利用几何光学和傅立叶光学给出不同屈光度下光强分布情况。
In the case of little circular light source and rectangular slit, the simulation results of different myopic diopters are obtained by geometrical optical theory and Fourier optics respectively.
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