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Unformatted text preview: radians 10 67 . 1 mm 1 . 1 5 . 1 2 nm 500 1 2 3 x n x t . Problem 32 (like 27.22): What is the separation of the 2 second order diffraction peaks (to either side of the principle diffraction maximum) on a screen 5 m away when green laser light of wavelength 500 nm passes through a slit with a width of 25 m? a) 100 m ; b) 10 cm ; c) 10 m ; d) 1 m ; e) 100 nm What do you know? From the graph, the angular separation of the two 2 nd order diffraction peaks will be a / 3 3 . We calculate a / = 500 nm / 25 m = 20 x 103 radians. At 5 m away this becomes 5 m x 20 x 103 radians = 0.1 m. 1...
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 Spring '04
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