Question: a high resolution grating 2 6 0 mm wide, with 3 0 0 lines per mm at about 7 5 degrees in autocollimation has a

a high resolution grating 260 mm wide, with 300 lines per mm at about 75 degrees in autocollimation has a resolving power of just about 10^6 for 500 nm. Find its free spectral range. How do these values of R and delta lambda compare with those of a fabry perot

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