Exam-style question
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Explain how the spacing of fringes in a diffraction pattern is affected by the wavelength of light and the grating spacing.
Model answer
What a good answer should say
- The spacing of fringes increases with a longer wavelength or a smaller grating spacing.
- This is because a longer wavelength causes greater diffraction, leading to wider fringe separation, while a smaller grating spacing allows for more pronounced diffraction effects.
Explanation
Why this works
This answer demonstrates an understanding of the relationship between wavelength, grating spacing, and fringe spacing in diffraction patterns, which is crucial for analyzing spectra using diffraction gratings.
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