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139 To examine the diffraction pattern produced by a plane beam of monochromatic light, with a wavelength of 450 nm, a converging lens is used

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139 To examine the diffraction pattern produced by a plane beam of monochromatic light, with a wavelength of 450 nm, a converging lens is used which focuses the image on a screen. The focal length of the lens is 1.2m. The diffraction grating used has a pitch of 0.012 mm. At what distance from the central light fringe will the first lateral light fringes be produced?

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139 .. Per esaminare la figura di diffrazione prodotta da un fascio piano di luce monocromatica, con lunghezza d'onda 450 nm, si usa una lente convergente che mette a fuoco l'immagine su uno schermo. La distanza focale della lente vale 1,2 m. Il reticolo di diffrazione usato ha un passo di 0,012 mm. a a . A quale distanza dalla frangia luminosa centrale si produrranno le prime frange luminose laterali? [4,5 cm]

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