A plane electromagnetic wave falls at right angles to the surface of a plane-parallel plate of thickness

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A plane electromagnetic wave falls at right angles to the surface of a plane-parallel plate of thickness l. The plate is made of non-magnetic substance whose permittivity decreases exponentially from a value el at the front surface down to a value ε2 at the rear one. How long does it take a given wave phase to travel across this plate?
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College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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