One method of tuning a Fabry-Perot cavity is to change the gas density in the space between the two mirrors. (Even though the index of most gases is very close to 1, there is a small positive part proportional to density.) The following is a sketch of the transmission through the cavity of 0.6328 /Lm radiation when the gas pressure is changed. The spacing between the mirrors is fixed at 1 cm
(a) By how much has the index of refraction changed between the points labeled B and A?
(b) What is the photon lifetime of the cavity?.
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