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高中物理课本下册关于光的干涉的演示实验,由于透过狭缝的光的强度太弱,且缝的宽度很难刻好,多数中学不容易做成功;而牛顿环、肥皂膜以及用狭缝观察太阳等所形成的干涉现象,虽然容易做成功,但图形小,不便在全班范围里观察。这里介绍的“破镜干涉”,仪器简单,效果明显,可以在教室进行演示。 实验方法如下:取一面有镜框的破镜(亦可取两块镜面拼成,而后加上镜框。但用一块裂成两半的镜子来做效果更好),将其挂在墙上,或立于讲台上,在与镜面垂直、距镜面3—8米处置一功率较大的白炽灯(如100瓦),将镜面稍微调整一下,调到两半破镜合在一起照人,所得的像跟完整的镜子照的差不多
The demonstration of light interference in the high school physics textbook next book, because the intensity of light through the slit is too weak, and the width of the seam is difficult to engrave, most secondary schools are not easy to succeed; Newton ring, soap film and narrow While observing the interference phenomenon formed by the sun and the like, although it is easy to succeed, the pattern is small and it is inconvenient to observe in the entire class. The “interference of the mirror” introduced here is simple and the effect is obvious. It can be demonstrated in the classroom. The experimental method is as follows: Take a broken mirror with a mirror frame (can also take two pieces of mirror to spell, and then add a frame. But use a split mirror to do better), hang it on the wall, or stand On the rostrum, dispose of a large incandescent lamp (eg, 100 watts) perpendicular to the mirror and 3 to 8 meters from the mirror. Adjust the mirror slightly and adjust it to the halves. It’s almost like a full mirror