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Assignment5_solution

# Assignment5_solution - 4 2 cos f t m d = for maximum at...

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Assignment5 TAs’ Solution Problem 1 9.4 A bulb at S would produce fringes. We can imagine it as made up of a very large number of incoherent point sources. Each of these would generate an independent pattern, all of which would then overlap. Bulbs at S 1 and S 2 would be incoherent and could not generate detectable fringes. Problem 2 9.6

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9.10 a m m λ θ = , since violet red , 2 , 1 θ θ = , nm a a violet violet red 390 2 1 = = λ λ λ Problem 3 9.23 m a m a s y 10 10 33 . 8 ) / 3 ( ) / ( - × × = = Δ λ m a 5 10 5 2 / - × = Problem 4 9.27 The reflection index of glass is greater than ethyl alcohol. In both side, there is an additional phase shift. So different with Eq.9.36
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Unformatted text preview: 4 2 cos f t m d = , for maximum at normal incidence and taking m=0. m nm n m m d f × = = = 184 4 2 4 2 (m=0,1,2…) Problem 5 9.32 According to equation 9.42 R m x f m ) 2 1 ( + = m m x R f m 76 . 9 ) 2 / 1 ( 2 = + = Problem 6 1 1 = n , 75 . 1 3 = n , the reflective index of the coating should be 32 . 1 3 1 2 = = n n n For maximally reduce the reflection at 550nm, the thickness of the coating should be nm n m t 104 4 ) 1 2 ( 2 = + = (m is set to 0 for minimal thickness)...
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