Explanation of why we see green when white light is shone at a green book and why a book appears black when blue light is shone through a green filter.
When white light is shone at a green book, we see the color green because chlorophyll, the green pigment in plants, absorbs all colors except green, which it reflects. If blue light is shone through a green filter, the book will appear black because chlorophyll cannot absorb blue light, so it will not reflect any color, appearing black. This is due to the selectivity of chlorophyll in utilizing specific wavelengths of light for photosynthesis.
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