Question: Two extremely narrow, parallel slits are cut in a sheet of cardboard, with the width (a) of each slit very much smaller than the distance

Two extremely narrow, parallel slits are cut in a sheet of cardboard, with the width $a$ of each slit very much smaller than the distance $d$ between them. When the slits are illuminated by a coherent beam of $620-\mathrm{nm}$ light, the angular position of the two third-order bright fringes is $\pm 4. 27^{\circ}$. The cardboard between the slits is then cut out so that the sheet contains only a single opening. When this opening is illuminated by the $620-\mathrm{nm}$ light, what are the angular positions of the $n=1,2,3$ dark fringes?

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The angular positions of the n123 dark fringes can be determined using the doubleslit interference formula and the singleslit diffraction formula For ... View full answer

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