Wearing black pants can make you slim, because there are visual differences, that is, there will be optical illusions, which will lead us to think that people wearing black pants? Thin? Yes When we see that it is actually the same object, but the colors of the two objects are different, one is white and the other is black, we will visually feel that the volume of the white object will be larger than that of the black object. In other words, what do we think is the volume of a black object? Shrinkage? However, there is no difference between these two objects except color. Explaining this physical phenomenon in scientific terms is called light penetration.
This truth is actually very simple. We all know that visible light in nature is a mixture of seven colors, each with a different wavelength, of which red has the longest wavelength and purple has the shortest wavelength. And when we see different wavelengths of light, the clarity of death in our eyes will be different. The color with short wavelength will make us look clearer visually, that is to say, the cool color has the effect of convergence, while the color with long wavelength will look blurred, that is to say, the warm color will make people feel the effect of expansion. Therefore, when we see two things with the same area but different colors, we will have an illusion in vision, which is actually called optical illusion.
Although black and white is not seven-color light, it can also produce optical illusion, mainly because transparency can also lead to expansion and convergence, so in some specific environments, wearing black pants or dark clothes will make people look thinner. However, wearing white or light-colored clothes does not necessarily make people look fatter, but it may exist under certain circumstances.