Quick questions on Young's double-slit interference: WACE Year 12 Physics Unit 4

Q: What is fringe spacing on the screen?

For small angles and a screen a distance L from the slits, the bright fringes are evenly spaced by

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What is fringe spacing on the screen?

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For small angles and a screen a distance

L

from the slits, the bright fringes are evenly spaced by

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