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Monochromatic light strikes a diffraction grating

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Answer #1

w = 3D\lambda/d

1.55 = 3 x 1.95 \lambda/d

\lambda/d = 0.265

for second order :

w' = 5D\lambda/d = 5 (1.95) (0.265) = 2.6

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Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 1.95 m away....
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