Calculating Slit Width from Diffraction Pattern

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Homework Help Overview

The problem involves calculating the slit width in a single-slit diffraction experiment using a He-Ne laser. The context includes analyzing a diffraction pattern observed on a screen positioned at a specific distance from the slit.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the application of the diffraction formula and the correct interpretation of "distance of minima." There is an exploration of how to determine the appropriate distance for the minima in relation to the pattern.

Discussion Status

Some participants are clarifying the equation and its components, while others are questioning the values used for the distance of minima. There appears to be an ongoing exploration of the correct approach without a definitive consensus yet.

Contextual Notes

Participants are working with specific measurements and values, including the wavelength of the laser and distances involved in the diffraction pattern. There is mention of potential misunderstanding regarding the minima distances.

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Homework Statement



The diffraction pattern shown in the figure is produced by passing He-Ne laser light (λ = 632.8 nm) through a single slit and viewing the pattern on a screen 1.58 m behind the slit.

What is the slit width?

28-38.gif


Homework Equations



a = {(wavelength)D}/(distance of minima)

The Attempt at a Solution



a = {(632.8 x 10^-9)(1.58)}/(.152)

Answer: slit width = 6.577 x 10^-6 which is very wrong.

I feel like my equation is definitely wrong.
 
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Last edited by a moderator:
So by dividing by .076 instead of .152 I get 1.316 x 10^-5 which is incorrect. I must be misunderstanding you, sorry.
 
Octoshark said:
So by dividing by .076 instead of .152 I get 1.316 x 10^-5 which is incorrect.
0.076 would be the distance from the center to which minima?
 
Ahhh, got it. Thanks a bunch ;)
 

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