Did you know that light travels in waves? There are both visible and invisible light waves. Most light sources give off white light and white light has seven colors that are revealed under the right circumstances. Scientists use a tool called a prism to see the seven colors in the light spectrum as they pass through the prism. To remember the seven colors in the color spectrum you can think ROY G BIV. ROY G BIV stands for red, orange, yellow, green, blue, indigo, and violet.
When you look at an object, the color of the object is determined by the color of the light that is reflected and absorbed. For example, a red shirt reflects red but absorbs orange, yellow, green, blue, indigo, and violet. White objects reflect all colors and black objects absorb all colors. That's why you're cooler on a hot summer day in white than black.
Today in class, we watched a short video. Click on this to watch the video. We also looked through prisms to observe the separation of the seven colors in the spectrum.