How to determine the wavelength of light using Young’s double slit experiment. 

The set up is as shown above, where S, S₁, and S₂ are narrow slits through which light diffracts forming interference fringes on a transparent screen. The position of the screen is adjusted until fringes are seen clearly. The number of fringes occupying a measured length along the screen is counted and the width y of a single fringe determined. The distance D, of the double slit from the screen is measured using a meter rule and the separation, a, of the double slit determined using a travelling microscope. The wavelength λ =ay/D

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