Question

A Ronchi ruling of spatial frequency 20 lines per mm is placed on the input plane of the optical system. Consider the system consists of Tessar lenses of F 30 cm Suppose that the light illuminating the optical system has a wavelength of 0.633 m Input (FTP) Spatial (decomposes) Frequency (recomposes) Spectrum Output Tessar Lens Tessar Lens F F a) What is the separation between +2 order and -1 order diffraction on FTP? b) If the (first Tessar) lens in the system is of f/5.6, how many orders could be observed on FTP?

Answer 1

20 inesm Gover Se Spatal Ca Succen ve re tueen any Spacing -O.05 mm F = Зост o.633 m adan 2.46 and at order Second Ocurs maxima at -142 2. 46 2.46 SinB , = 43 43 Se para ton e toeen ondes and oider + 2 = ( e,) F C2,46 43 F 3.89 30 x(o 48 Cm Separakn crdar etwen ords and +2 S5-6 means N = F = 30 Cm D = 30 5.36 Cm 1 S.6 angular Rasolutian Now o.61 rst order knouw diferaten angle we .43 .43X h = 2.34 D 2.34 X 5 36 2508 ordey. n 0.oOS Fourier Tranfonm plane On orders Ca e FTP namter Sen are aso A