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When Newton placed a second identical prism in an INVERTED position relative to the first, what was the result?

Question
When Newton placed a second identical prism in an INVERTED position relative to the first, what was the result?
Even more colours appeared
All the colours recombined into a beam of white light
The light was completely absorbed
Only violet light emerged
Answer
All the colours recombined into a beam of white light
Detailed Explanation
The chapter states that placing a second inverted prism allowed all the spectral colours to recombine into a beam of white light emerging from the second prism.
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