A-level Physics · Interference
Double-slit fringe spacing
Use w = λD/s to find the fringe spacing, wavelength, slit separation or screen distance.
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Question 1
Light of wavelength 578 nm is incident on a double slit of slit separation 0.80 mm. Fringes are seen on a screen 3.9 m from the slits. Calculate the fringe spacing, in mm. Give your answer to 3 significant figures.
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