What Is the Diffraction Constant in This Double Slit Experiment?

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Homework Help Overview

The problem involves monochromatic light of 625 nm wavelength interacting with an optical bar, leading to the appearance of light lines. The original poster seeks to determine the diffraction constant, which may relate to the setup of a double slit or a diffraction grating.

Discussion Character

  • Conceptual clarification, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to use a trigonometric relationship involving the wavelength and the number of lines to find the distance between slits. There is uncertainty regarding the definition of the "diffraction constant." Some participants suggest that it may refer to the grating constant, leading to further questions about its specific meaning in the context of the problem.

Discussion Status

Participants are exploring different interpretations of the term "diffraction constant" and discussing its potential equivalence to the grating constant. There is a recognition of the need to clarify terminology and definitions, particularly regarding the relationship between the distance between lines and the number of lines per unit length.

Contextual Notes

There is ambiguity in the terminology used, as the thread title refers to a "double slit" while the content discusses a "diffraction bar." This may affect the understanding of the problem setup and the definitions being applied.

diredragon
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Homework Statement


monochromatic light of 625 nm of wavelength falls normal to the optical bar. Total number of light lines that appear behind the bar is 11. What is the constant of the difraction bar?

Homework Equations


3. The Attempt at a Solution [/B]
I tried ##dsinx=ms## where ##s## is the wavelength and ##m## is number of lines. Since x is 90 i can calculate the ##d## to find the distance between the slits but what is diffraction constant?
 
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"Constant of the diffraction bar" might be referring to the "grating constant". The grating constant usually denotes the number of lines of the grating per unit length (often given as lines per millimeter). However, I've also seen people refer to the distance between two lines as the grating constant. So, you might need to consult your notes or textbook to see how it is used in your course.
 
I think it is lines per mm, is that 1/d?
 
diredragon said:
I think it is lines per mm, is that 1/d?
Yes. If you express d in mm, then you can think of d as the number of mm per line (mm/line). So, the units for 1/d would be ...?
 
Your title for this thread refers to "double slit". But the question refers to a "diffraction bar", which I was thinking might be a diffraction grating. So, I'm not sure what you're actually dealing with here.
 

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