A slab of transparent material has thickness d and refractive index n that varies across the material:

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A slab of transparent material has thickness d and refractive index n that varies across the material: n(x) = n1 + (n2 - n1)(x/d2), where x is measured from one face of the slab. A light ray is incident normally on the slab. Find an expression for the time it takes to traverse the slab.

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Essential University Physics

ISBN: 978-0321976420

3rd Edition Volume 2

Authors: Richard Wolfsonby

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