First, most objects cannot emit light, but they
can absorb and reflect sunlight. Seven
different colors of light--red, orange, yellow,
green, blue and violet--mix together and create
the white color of the sunlight.
The light that objects reflect can be seen by our
eyes. In other words, the color of the object is
the color of the light that the object reflects. For
example, when we see that an object is red, this means
that this object reflects red light and absorbs
other six colors of the sunlight. Therefore,
when we see that an object is black, this means
it does not reflect any color of the sunlight
and it absorbs all seven colors of the sunlight.
Sunlight is made up of many types of light,
including all the colors of the rainbow (but there
is no such thing as black light or dark light).
When you shine each type of light on a surface,
the surface will do one of two things:
1. The surface can reflect that color of
light, which makes the light bounce off the
surface and reach your eyes. Then you will see
that the surface "is" that color.
2. The surface can absorb that color of
light. Then you will not see that color on the
surface, since it will not reach your eyes.
If a surface absorbs all types of light (or
almost all types of light), it will appear black
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