Unformatted text preview: λ 1 n (6) Solve for λ 1 and equate the 2 expressions: λ 1 = d sin θ a / 2 = nd sin θ b / 2 (7) The d and 2 cancel, leaving: sin θ a = n sin θ b (8) Some possibly useful equations: Young’s doubleslit: d sin θ bright = mλ ( m = 0 , ± 1 , ± 2 , ... ) d sin θ dark = ( m + 1 / 2) λ ( m = 0 , ± 1 , ± 2 , ... ) I avg = I max cos 2 ( πd sin θ λ Constructive interference in ﬁlm: 2 nt = ( m + 1 / 2) λ ( m = 0 , 1 , 2 , ... ) Destructive interference in ﬁlm: 2 nt = mλ ( m = 0 , 1 , 2 , ... ) Diﬀraction grating: d sin θ bright = mλ ( m = 1 , 2 , 3 , ... ) n 1 sin θ 1 = n 2 sin θ 2 1...
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 Spring '08
 Wu
 Work, Diffraction, Light, Wavelength, Sin, Diffraction grating

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