HW12%20solutions

HW12%20solutions - Homework 12 solutions Physics 204,...

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Homework 12 solutions Physics 204, morning summer 2008 Chapter 27 Problems 10,11 Chapter 28 Problems 2,6 10. REASONING AND SOLUTION This problem is analogous to Example 3 in the text, where the condition for destructive interference is obtained as 2 tm = λ film . For the minimum non-zero thickness, m = 1. In addition, the wavelength in the film is given by Equation 27.3: film vacuum = / n . Therefore, green light is removed when the minimum non-zero thickness is t m n == F H G I K J = F H G I K J = 2 1 2 1 2 551 133 film vacuum nm 207 nm . 11. SSM REASONING When the light strikes the film from above, the wave reflected from the top surface of the film undergoes a phase shift that is equivalent to one-half of a wavelength, since the light travels from a smaller refractive index ( n air = 1.00) toward a larger refractive index ( n film = 1.33). On the other hand, there is no phase shift when the light reflects from the bottom surface of the film, since the light travels from a larger refractive index ( n film = 1.33) toward a smaller refractive index ( n air = 1.00). Thus, the
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This note was uploaded on 10/04/2009 for the course PHYS 750:204 taught by Professor Rollino during the Spring '09 term at Rutgers.

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HW12%20solutions - Homework 12 solutions Physics 204,...

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