Fringe with of interference pattern

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Homework Help Overview

The discussion revolves around calculating the fringe width of an interference pattern produced by two coherent light sources. The sources are 1mm apart, emitting light with a wavelength of 600 nm, and the pattern is observed on a screen located 50cm from the sources.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the meaning of variables in the equation for fringe width and clarify the definitions of distance and wavelength. There is an initial uncertainty about how to approach the problem.

Discussion Status

Some participants have provided clarifications regarding the variables involved in the equation. An attempt at a solution has been made, and there is a positive acknowledgment of the calculations presented, indicating a productive direction in the discussion.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the amount of guidance provided. There is an emphasis on understanding the relationships between the variables involved in the interference pattern.

looi76
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Homework Statement


Calculate the fringe width of an interference pattern created by two coherent source, 1mm apart and emitting light of wavelength 600 nm. the pattern is observed on a screen 50cm from the source

Homework Equations


x = dλ/a

The Attempt at a Solution


I don't know how to start...
 
Last edited:
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Well you must have some idea since you know the equation.
 
λ = wavelength, can you tell me what does x, d and a represent.
 
looi76 said:
λ = wavelength, can you tell me what does x, d and a represent.
x represents the width of the fringe, d represents the distance between the slits and the screen; and a represents the slit separation. Surely you have a textbook and/or class notes?
 
Thanks Hootenanny... I think I got it...

d = 50cm , a = 1mm , λ = 600nm

d = 50*10^-2m
a = 1*10^-3m
λ = 600*10^-9m

= (600*10^-9*50*10^-2)/(1*10^-3)
= 3*10^-4m
 
Looks good to me :smile:
 

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