Question

4. Below is an image of the fringe pattern produced by two identical slits and light of wavelength, 600 nm. The pattern is produced on a screen 1.0 meters from the slits. Using the provided scale, determine the separation between the slits and the width of one individual slit. Explain your reasoning a) Separation between the two slits: b) Width of one individual slit:

Answer 1

4a)

X = Fringe width = Distance between consecutive dark or bright = 4cm ( from the figure )

X = $\lambda$D/d,  $\lambda$ = wavelength , D = 1 m , d = distance between slits

d = $\lambda$ D / X = 600 * 10^-9 * 1 / 4 * 10^-2 = 1.5 * 10 ^-5 m