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Red Spotted Purple

This is another butterfly whose scales are optically active. These scales reflect back color from white light. The process is called thin film interference an...
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This is another butterfly whose scales are optically active. These scales reflect back color from white light. The process is called thin film interference and is seen commonly in soap bubbles and oil slicks. In the case of the scales of butterflies the color is angle dependent which is also called iridescence.
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