A high-resolution grating 260 nun wide, with 300 lines per millimeter, at about 75° in autocollimation has a resolving power of just about 106 for λ = 500 nm. Find its free spectral range. How do these values of R and (∆λ)fsr compare with those of a Fabry-Perot etalon having a 1-cm air gap and a finesse of 25?
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