Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 29 - Think and Explain: 49

Answer

Blue light.

Work Step by Step

The white sunlight minus some yellow leaves a small excess of blue, the complementary color. In reality, such a small fraction of the incoming light is reflected by the oil film that the color change of the transmitted light caused by interference would be nearly imperceptible compared to that caused by other causes (such as selective absorption). But it's a nice exercise to "reflect" on.
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