Light from a helium-neon laser (A=633 nm) isused to illuminate two narrow slits. The interferencepattern is observed on a screen 2.5 m behind theslits. Twelve bright fringes are seen, spanning adistance of 55 mm.Part AWhat is the spacing (in mm) between the slits?Express your answer in millimeters.15. ΑΣΦd=3.465 107 -10Submit Previous Answers Request AnswerX Incorrect; Try Again; 4 attempts remainingmm

We will answer this question using formula for fringe width of interference fringes. The steps are…

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