Why do "yin and yang clouds" appear?

Hello poster,

When sunlight passes through clouds from above, the small water droplets in the clouds will refract and scatter the light, and the light that directly passes through will be affected to varying degrees. Therefore, the water vapor accumulation state in the clouds, as well as the thickness of the clouds, will directly affect the degree of black and white.

For clouds in good weather, the water droplets formed by the combination of water vapor are smaller, mostly scattering, and have little impact on light. Even if they are thick, the impact on light is not great. , looks white or gray.

For dark clouds, due to the large combination of water vapor and refraction, which has a great impact on light, coupled with its thickness, it looks very dark and gray-black.

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