Abstract
It is shown how white light Fabry-Perot fringes are very easy to produce experimentally if correct attention is given to optical detail. Only low resolving power instruments are needed. The fringes appear as a large number of strongly curved narrow fringes extending across the whole spectrum. The relationship between these fringes and the fringes of equal chromatic order described in Part V. is discussed. The fringes described here have little practical application, but complete the systems possible from variations of the constituent terms in the formula = 2t cos θ.

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