L A : Number of bright fringes L B : Number of bright fringes L A : Number of br

Question

LA: Number of bright fringes LB: Number of bright fringes LA: Number of bright fringes LB: Number of bright fringes In a setup like that inthe figure below, a wavelength of 625 nm is used in a Young'sdouble - slit experiment. The separation between the slits isd = 1.4 x 10^ - 5 m. The total widthof the screen is 0.20 m. In one version of the setup, theseparation between the double slit and the screen isLA = 0.22 m, whereasin another version it is LB = 0.57 m. On one side of the central bright fringe, howmany bright fringes lie on the screen in the two versions of thesetup? Do not include the central bright fringe in yourcounting. LA: Number of bright fringes LB: Number of bright fringes

Explanation / Answer

ma= y*d/lambda*L            =0.10*1.4*10-5/625*10-9*0.22             =10 subtract the central fringe (i.e.1) from the total m Answer to part 1= 9 fringes          =0.10*1.4*10-5/625*10-9*0.57             =4 subtract the central fringe (i.e.1) from the total m Answer to part 2= 3 fringes             =4 subtract the central fringe (i.e.1) from the total m Answer to part 2= 3 fringes

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