What will be the effect, if any, on the fringe width in Young’
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    11. What will be the effect, if any, on the fringe width in Young’s double slit experiment if red light is used in place of violet light ?

    Fringe width is given by —

    straight B space equals space λD over straight d

    Triangle width is directly proportional to the wavelength of light used.

    So,

    λred > λvoilet

    Therefore, 


    straight beta subscript red space greater than thin space straight beta subscript violet
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