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What is the speed of a wavelength light in a material whose index of refraction is 1.42 regarding that wavelength?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter4: Diffraction

Section: Chapter Questions

Problem 72P: X-rays of wavelength 0.103 nm reflects off a crystal and a second-order maximum is recorded at a...

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What is the speed of a wavelength light in a material
whose index of refraction is 1.42 regarding that
wavelength?
You may round to the nearest million :)

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