Recall that the sine and cosine functions relate real number values to the x- and y-coordinates of a point on the unit circle. In this section, we will interpret and create graphs of sine and cosine functions. In the chapter on Trigonometric Functions, we examined trigonometric functions such as the sine function. Light waves can be represented graphically by the sine function.
The individual colors can be seen only when white light passes through an optical prism that separates the waves according to their wavelengths to form a rainbow. Instead, it is a composition of all the colors of the rainbow in the form of waves.
White light, such as the light from the sun, is not actually white at all. Figure 1 Light can be separated into colors because of its wavelike properties.
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