# Fabry-Perot problem

## Homework Statement

Show that it is only necessary to increase the distance L between two mirrors of a Fabry-Perot cavity by a distance $$\lambda$$/2 to scan the transmission peak over a range of one FSR

## The Attempt at a Solution

D=2L*sqrt(1+v^2/c^2)

## Answers and Replies

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I've started guiding you through the solution of your other posted problem. This attempt is really lame. Start by looking in your book and telling me what the FSR is.

my book doesnt have FSR anywhere.
I have never seen this type of problem.
can you please guide me

Try looking for for the phrase free spectral range. Then look for a graph of the transmission through a Fabry Perot etalon, can you tell me how to draw the FSR on this graph?