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Question: 
  1. For a given wavelength $\lambda$ what is the minimum slit width for which there will be no diffraction minima?
  2. What is the minimum slit width so that no visible light exhibits a diffraction minimum?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $\lambda$
  2. 400 nm

Giancoli 7th Edition, Chapter 24, Problem 27

(1:57)

Chapter 24, Problem 27 is solved.

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