With light falling normally on a diffraction grating, the angle of diffraction of second order is equal

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With light falling normally on a diffraction grating, the angle of diffraction of second order is equal to 45° for a wavelength λ1 = 0.65μm. Find the angle of diffraction of third order for a wave length λ2 = 0.50μm.
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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