Interactive LearningWare 27.1 provides a review of theconcepts that are importan

Question

Interactive LearningWare 27.1 provides a review of theconcepts that are important in this problem.

Two parallel slits are illuminated by light composed of twowavelengths, one of which is 645 nm. On a viewing screen, the light whosewavelength is known produces its seventh dark fringe at the same place where thelight whose wavelength is unknown produces its fourth-order bright fringe. The fringes are countedrelative to the central or zeroth-order bright fringe. What is theunknown wavelength??
nm

• Read the eBook
• • Section 27.1 The Principle of Linear Superposition
  • Section 27.2 Young's Double-Slit Experiment

• Read the eBook
• • Section 27.1 The Principle of Linear Superposition
  • Section 27.2 Young's Double-Slit Experiment

Explanation / Answer

SoI set it up as (2*7+1)*645/2 =4837.5 Then, divided 4837.5/4= 1209nm...didn't give me the correct answer though

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