Physics

In a Young's Double Slit experiment, the separation of four bright fringes is 2.5mm, the wavelength of light used is 6.2*10^-7m. If the distance from the slits to the screen is 80cm, calculate the separation of two slits.
I applied
4*¥D/d=1.5*10^-3m
but the answer didn't match. It matches when I use 3¥D/d instead of 4.
Shouldn't the separation of four bright fringes be 4¥D/d (after applying sin@=tan@ approximation)

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  1. 0 to 1
    0 to -1
    1 to 2
    -1 to -2
    that is three gaps

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    Damon

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