Calculating Fringe Positions in Two-Slit Interference Patterns

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SUMMARY

The discussion centers on calculating the position of the third-order bright fringe in a two-slit interference pattern, given that the fifth-order dark fringe is located 45.0 mm from the central bright fringe on a screen 500 mm away. The relevant equations for this problem stem from the principles of Young's double slit experiment. Participants emphasize the need to identify the correct equations for fringe positioning, despite lacking specific values for wavelength and slit width.

PREREQUISITES
  • Understanding of Young's double slit experiment
  • Familiarity with interference patterns and fringe orders
  • Knowledge of the relationship between fringe position and distance from the slits
  • Basic proficiency in algebra for solving equations
NEXT STEPS
  • Study the derivation of fringe position equations in Young's double slit experiment
  • Learn how to calculate fringe positions using the formula for dark and bright fringes
  • Research the impact of wavelength and slit width on interference patterns
  • Explore practical examples of two-slit interference problems
USEFUL FOR

Students studying optics, physics educators, and anyone interested in understanding the principles of light interference and fringe calculations.

Barry Melby
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Homework Statement


[/B]
Light passing through a two-slit grating makes a pattern on a screen located 500 mm away. In this pattern, the fifth-order dark fringe is 45.0 mm from the central bright fringe. How far from the central bright fringe is the third-order bright fringe?

Homework Equations


This is what I'm looking for help on.

The Attempt at a Solution


I'm not even sure which equations to use to solve this. Any ideas?
 
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You got a textbook you are working with? Is there a section on two slit interference (aka Young's double slit experiment)? What equation does it give there?
 
it's not in my book. any ideas?
How do i go about this with a dark fringe and a bright fringe if i don't know the wavelength or slit width?GOT IT.
 
Last edited:

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