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Problem 4: Coloured Line

When a compact disc or DVD is illuminated with light coming from a filament lamp in such a way that only rays with large angles of incidence are selected, a clear green line can be observed. The colour varies upon slightly changing the angle of the disc. Explain and investigate this phenomenon.

I. Phenomenon Demonstration

II. Books, Encyclopedia, Discussion and Forum Posts

III. Research Papers

  • Barreiro, J. J., Pons, A., Barreiro, J. C., Castro-Palacio, J. C., & Monsoriu, J. A. Diffraction by electronic components of everyday use. American Journal of Physics, 82(3), 257–261. (2014). 
  • R. De Luca, M. Di Mauro, O. Fiore, and A. Naddeo, American Journal of Physics 86, 169 (2018).

  • Fernández-Dorado, J., Hernández-Andrés, J., Valero, E. M., Nieves, J. L., & Romero, J. A simple experiment to distinguish between replicated and duplicated compact discs using Fraunhofer diffraction. American Journal of Physics, 76(12), 1137–1140. (2008).  
  • Birriel, J. J. Diffraction by “sheer coincidence”. The Physics Teacher, 56(9), 648–649. (2018).  


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