State the conditions necessary for interference to take place. In a Young's 2-slit experiment, the separation of the interference bands ?w is given by the equation: ?= λD/a is the wavelength of the light, D is the distance from the double slit to the screen and a is the distance between the slits. Given that D= 5 m, a= 0.25 cm, λ= 619 nm, calculate the fringe width w. Give your answer in millimetres.

State the conditions necessary for interference to take place. In a Young's 2-slit experiment, the separation of the interference bands ?w is given by the equation: ?= λD/a is the wavelength of the light, D is the distance from the double slit to the screen and a is the distance between the slits. Given that D= 5 m, a= 0.25 cm, λ= 619 nm, calculate the fringe width w. Give your answer in millimetres.

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