The color of the opaque body is determined by the color of the light it reflects. The object can reflect red light, and the hail is red. Black can absorb all color light so it is black.
The head color of a transparent body is determined by the color light it passes through, and red can only pass through red light, so it is red. White reflects all colors of light so it is white.
Usually through the object into our eyes there are three types of light: reflected light, transmitted light and emitted light, and we commonly see the sun, incandescent late astigmatism or daylight lights are white, they are composed of red, orange, yellow, green, blue, indigo, violet and other seven colors of light composite. When the white light hits the object, part of it is absorbed by the object, and the other part is reflected by the object, which is reflected light. Different objects will reflect different colors of light, some reflect red light, some reflect blue light, some reflect green light, these reflected light into our eyes, we see that some objects are red, some are blue, some are green, and the color of the object that does not reflect any light is black.
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