Light from a helium-neon laser ( = 633 nm) is used to illuminate two narrow slits. The
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Light from a helium-neon laser (λ = 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.0 m behind the slits. Twelve bright fringes are seen, spanning a distance of 52 mm. What is the spacing (in mm) between the slits?
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Model Two closely spaced slits produce a doubleslit interference pattern Visualize The interference pattern looks like the photograph of Figure 334b Solve In a span of 12 fringes there are 11 gaps between them The formula for the fringe spacing is Assess This is a reasonable distance between the slits ensuring dL 134 10 4 1 1 A plane wave is incident on the double slit 2 Waves spread out behind each slit Top view of the double slit 3 The waves interfere ...View the full answer
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Related Book For 
Physics for Scientists and Engineers A Strategic Approach with Modern Physics
ISBN: 978-0133942651
4th edition
Authors: Randall D. Knight
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