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Lights of different colours are arranged below in order of increasing wavelengths:1. Violet, indigo, blue2. Green, orange, red3. Red, green, indigo4. Blue, green, yellow Which of the above are in proper sequence?

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Lights of different colours are arranged below in order of increasing wavelengths:<br>1. Violet, indigo, blue<br>2. Green, orange, red<br>3. Red, green, indigo<br>4. Blue, green, yellow Which of the above are in proper sequence?






 
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