Thin film interference

IB Physics: Thin film interference

Joseph Fraunhoffer"s observation of colours as alcohol evaporated from a sheet of glass is an example of serendipity.Having dealt with the superposition of waves from two point sources and understood how the phase difference is related to path difference, it is a small step to understand how the path difference introduced when light reflects off each side of a soap film causes areas of bright and dark. When drawing this...

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