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Chapter 9: Problem 4

The cover of a book appears blue when illuminated with white light. What color will it appear in blue light? Red light? Explain.

Short Answer

Expert verified
Answer: The book cover will appear blue under blue light and black under red light.

Step by step solution

01

Understand color perception and object color

When an object appears a certain color to us, it is because it reflects that color and absorbs the other colors. This concept is based on the RGB color model, which indicates that there are three primary colors: red, green, and blue. In this case, the cover of our book appears blue when illuminated by white light (which contains all colors).
02

Determine the color of the book under blue light

Since the book cover appears blue under white light, it means that it reflects blue light and absorbs the other colors. When we illuminate the book cover with blue light, it will continue to reflect the blue light, causing it to appear blue.
03

Determine the color of the book under red light

When the book cover is illuminated by red light, it will absorb the red light (since it reflects only blue light and absorbs the others). This means that there will be no light being reflected back to our eyes, causing the book cover to appear black. So, the book cover will appear blue under blue light, and black under red light.

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