Consider a monochromatic beam of wavelength 6000 Å incident normally on a scanning Fabry-Perot interferometer with n2 = 1 and F = 400. The distance between the two mirrors is written as h = h0 + x. With h0 = 10 cm, calculate
(a) The first three values of x for which we will have unit transmittivity and the corresponding value of m.
(b) Also calculate the FWHM Δh for which the transmittivity will be half.
(c) What would be the value of Δh if F was 200?
[Ans: (a) x ≈ 200 nm (m = 333334),
500 nm(m = 333335); (b) Δh ≈ 8 nm].
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