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高中物理第一册(必修)《教学参考书》(人教社90年版)236页写道:“水波经过大孔后,可近似地看作是‘直进’的,但边沿应该是模糊的,不会像刀切的那么齐——有衍射现象。正如太阳光从窗户射进来,粗略地看明暗界线是分明的,窗框的影子很整齐;但是仔细去观察影子的边缘时,就会看到模糊的,明暗界线不是像刀切一般的齐。”笔者认为,有必要将上述两个现象加以区别。波产生明显衍射的条件,是孔的尺寸比波长小或差不多。由于1米左右的窗户宽度比光波波长大好几
High School Physics Book 1 (required) “Teaching Reference Book” (Ren Jiaosha 90 Edition) 236 pages writes: “After the water wave passes through the big hole, it can be regarded as a ’straight forward’, but the edge should be blurred. It’s not like knife-cutting - it’s diffractive. Just as the sun shines through the window, it’s clear that the dark boundary is clear and the window frame’s shadow is neat; but when you look closely at the shadow’s edge, Obviously, the boundary between light and darkness is not like knife-cutting. ”The author thinks that it is necessary to distinguish the above two phenomena. The condition under which the wave produces significant diffraction is that the size of the hole is less or less than the wavelength. Because the width of the window is about 1 meter is much larger than the wavelength of the light wave