Solving Fabry-Perot Problem: Increase L by \lambda/2 to Scan FSR

[tuanle007]

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

Homework Equations

The Attempt at a Solution

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

 

[sx70]

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.

 

[tuanle007]

my book doesn't have FSR anywhere.
I have never seen this type of problem.
can you please guide me

 

[sx70]

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?