A light ray of frequency 5.0 x 1014 Hz is incident on a diffraction grating that has 180 lines/cm. After passing through the grating the light travels 4.0 m in a trough of water to a screen where it produces an interference pattern. How far apart are the bright fringes on the screen? (Note: nwater = 1.33 and n = c/v ) (3.2 cm)

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter35: Diffraction And Interference
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A light ray of frequency 5.0 x 1014 Hz is incident on a diffraction grating that has 180 lines/cm. After passing
through the grating the light travels 4.0 m in a trough of water to a screen where it produces an interference
pattern. How far apart are the bright fringes on the screen? (Note: nwater = 1.33 and n = c/v ) (3.2 cm) 

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