Irodov – Problems in General Physics

(a) the position of rings;

(b) the angular width of fringes

depends on the order of interference.

5.96. For the Fabry-Perot etalon of thickness d = 2.5 cm find:

(a) the highest order of interference of light with wavelength

= 0.50 p,m;

(b) the dispersion region \X, i.e. the spectral interval of wave-

lengths, within which there is still no overlap with other orders of

interference if the observation is carried out approximately at

wavelength X = 0.50 pm.

5.3. Diffraction of Light

• Radius of the periphery of the kth Fresnel zone:

rk=17 ab

a+b '

k-1

'

2

' 3 ' • •

• Cornu's spiral (Fig. 5.19). The numbers along that spiral correspond to
  the values of parameter v. In the case of a plane wave v = xii2lbk, where x

Fig. 5.19.

and b are the distances defining the position of the element dS of a wavefront

relative to the observation. point P as shown in the upper left corner of the

figure.

(5.3a)

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