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the only one I am having trouble with is the followng:

QUESTION

An air-spaced fabry perot consists of two exactly parallel reflecting surfaaces, separated by a distance of 1 cm. What is the frequency seperation between neighbouring transmission peaks?

....In truth I have not until reading this question even heard of a Fabry Perot and am having trouble finding concise information in the literature that will allow me to answer this question... As I say these are very short revision questions so I assume the answer is no more than a line or two... Any nudges in the right direction would be great, also any advice on good introductory online material on this subject would be useful