Chapter 28, Problem 9A

How can yellow be produced on a screen if only red light and green light are available?

To determine

To discuss on the yellow can be produced, only with red and green lights are available.

Explanation of Solution

Introduction:

The principle of color addition is used for a better understanding of perceived color by the human eye. It works on the principle of mixing colors light.

It is well known that the primary colors of light are red, green and blue. Practically, if white light shining on an object then red, green, and blue light shines on that object. If the object absorbs red light, then only blue and green light will be reflected from the object.

Consider the process of color subtraction. It is the process, the color that the appearance of an object will be known by identifying which colors of light are subtracted from the original colors.

For example, the green, red, and blue light strikes on an object, only red and green light will reflect from it. Red and green light strikes on the human eye always give the appearance of yellow, so, the object will appear yellow.

Let see the below equation of color subtraction for better understanding.

W-B = (R + G + B) - B = R + G = Y

Conclusion:

From the color of subtraction, it is concluded that yellow can be produced by adding green and red primary additive colors.