From the ultraviolet spectrum of light, the visible region or the light visible to the naked eye is the rainbow color, also known as the ROYGBIV. When these colors hit a prism, it reflects white light. In other words, white light is not technically a color. It is an indication of the presence of all visible colors.
However, white light can also be produced by mixing three colors at certain frequencies. When you mix the primary colors -red, blue and green - you also produce white light. Therefore, the answer is white light.
