Light from a helium-neon laser 633 nm is used to


Light from a helium-neon laser (λ = 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.4 m behind the slits. Twelve bright fringes are seen, spanning a distance of 54 mm .

Part A:

What is the spacing (in mm) between the slits? 

Express your answer using two significant figures.

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Physics: Light from a helium-neon laser 633 nm is used to
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