Final answer:
A white marker with black vertical stripes reflects all colors of light in the white areas and absorbs all colors of light in the black areas, according to how objects display color through absorption and reflection.
Step-by-step explanation:
The question asks what happens when white light encounters a white marker with black vertical stripes. Based on the provided reference material, we know that an object that reflects all colors of light appears white. This is because white is the equal mixture of all visible wavelengths. Conversely, an object appears black if it absorbs all colors of light, indicating the absence of light reflection. Therefore, the white areas of the marker reflect all colors, while the black stripes absorb all colors.
However, the marker itself does not emit light; the colors we see are due to the reflected light. Given this information, the correct answer to the question is that a white marker with black vertical stripes reflects all colors of light in the areas that are white, and absorbs all colors of light in the areas that are black.