What Color Does a Blue Book Appear Under Monochromatic Red Light?

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In monochromatic red light, a blue book primarily appears black because it absorbs all red wavelengths and reflects none. However, the specific shade of blue can affect this outcome, as some blues may reflect small amounts of red. The discussion highlights that the reflection coefficient at the red wavelength is crucial for determining the perceived color. The conversation suggests that this scenario resembles a typical homework question related to color perception in different lighting. Understanding the interaction between light and color is essential in this context.
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in monochromatic red light a blue book will appear?

A)black
B)red
C)purple
D)blue
 
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black. the blue book absorbs all the red, leaving nothing to be reflected to the eyes.
 
In the ideal circumstance, Bloodthunder is right. But of course, there are infinite shades of blue. Many blues contain a lot of red.
 
Technically, it would only appear black if the reflection coefficient at said wavelength is precisely zero.

The apparent spectrum (as visible to an observer) is the incident light times the reflection spectrum.

P.S. Sounds like a homework question.

Claude.
 

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