An oscilloscope is a widely used electronic measuring instrument. It can transform the invisible electrical signals into visible images, so that people can study the changes of various electrical phenomena. The oscilloscope uses a narrow, high-speed electron beam that strikes the phosphor-coated screen to create a small spot. Under the action of the signal under test, the electron beam is like the tip of a pen, which can plot the instantaneous value of the measured signal on the screen. The oscilloscope can be used to observe waveforms of various signal amplitudes over time, and can also be used to test various types of power, such as voltage, current, frequency, phase difference, amplitude, and so on.
A mirror is an optical element that works by using the law of reflection. Mirrors can be divided into plane mirrors, spherical mirrors and aspherical mirrors according to their shapes; According to the degree of reflection, it can be divided into total reflection mirror and semi transparent and semi reflection mirror (also known as beam splitter).
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