When an object appears to be not absorbing white light, it means that it is reflecting all the colors of the visible spectrum equally. White light is a combination of all the colors of the spectrum, and when it falls on an object, the object absorbs some colors and reflects others.
The color of an object that we perceive is determined by the wavelengths of light that it reflects. For example, an object appears red because it reflects red light and absorbs other colors. Similarly, an object appears blue because it reflects blue light and absorbs other colors.
However, an object that appears white reflects all the colors of the visible spectrum equally. This occurs when an object either has a surface that efficiently reflects all wavelengths of visible light or has a material that scatters and reflects light in all directions without preferentially absorbing specific colors.
One example of an object that appears white is a white piece of paper. The paper contains a mixture of pigments or materials that scatter and reflect light across the entire visible spectrum, giving the perception of white.
It's important to note that the perception of color is a complex phenomenon influenced by the properties of light, the object's surface, and our visual perception. The interaction of light with objects can involve absorption, reflection, scattering, and transmission, leading to the diverse range of colors we observe in the world around us.