a paralle beam of light from a He-Ne laser with a wavelength656 nm falls on two

Question

a paralle beam of light from a He-Ne laser with a wavelength656 nm falls on two vwer narrow slits 0.060 m apart how far apartare the fringes in the centre of the pattern on a screen 3.6 maway When finding the distances between the fringes in the centerof the pattern on a screen, I understand x= mL/ d givesme the 1st fringe where m=1... but
Why is the center of the pattern 2 x x? a paralle beam of light from a He-Ne laser with a wavelength656 nm falls on two vwer narrow slits 0.060 m apart how far apartare the fringes in the centre of the pattern on a screen 3.6 maway When finding the distances between the fringes in the centerof the pattern on a screen, I understand x= mL/ d givesme the 1st fringe where m=1... but
Why is the center of the pattern 2 x x?

Explanation / Answer

       in the given problem from the theory we cansee that for the constructive interference the path differenceis a multiple of    the wavelength    d sin = m    m = 0, 1, 2, 3, .........    location of the screen is given from    y = L tan    for small angles    sin =    y = L (m / d)       = m L /d    as for adjecent fringes we use    m = 1    so we have    y = L m /d         =.........m

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