The quantity E(vector)B(vector) is invariant. What does this say about how different observers will measure the angle

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The quantity E(vector)•B(vector)  is invariant. What does this say about how different observers will measure the angle between E(vector) and B(vector) in a light wave?

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Related Book For  answer-question

Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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