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26_InstSolManual_PDF_Part4 - 26-4 Chapter 26 340 m s v 5 5...

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26.14. Set Up: The interference of these two coherent sources obeys the same equation as in the Young two-slit experiment. Solve: (a) Constructive interference occurs when Since can’t be larger than 1.00, the equation isn’t satisfied for (b) Destructive interference occurs when 26.15. Set Up: For both reflections, both from the bottom and from the top surfaces of the film, the waves reflect from a material of greater n and undergo a half-cycle reflection phase shift. The condition for destructive interference therefore is where is the wavelength in the film. The thinnest film is for Solve: Reflect: Since the path difference 2 t occurs in the film we must compare 2 t to the wavelength in the film. 26.16. Set Up: The interference is destructive since the film appears black. The waves reflected from the front surface of the film (waves in air reflecting from water) undergo a half-cycle reflection phase shift. The waves reflected from the back surface of the film (waves in water reflecting from air) do not undergo a reflection phase shift.
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