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definition of slit width (1 Viewer)

Akshara Patil

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So can someone clarify the definition of 'd' in the diffraction grating formula - some qs use it for the width of the slit, whereas others use it for the separation between slits?
 

wizzkids

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Yes, the use of the same symbol "d" can be a bit confusing for students.
When we analyse the diffraction pattern produced by a single slit, then d is the symbol given to the width of the slit. As light passes through a single slit, it creates a single bright band accompanied by diffraction fringes on the left and right sides.
When we analyse the diffraction pattern produced by multiple slits (e.g. a diffraction grating), then d is the symbol given to the spacing between the slits. A diffraction grating creates an extended pattern of bright and dark fringes.
 

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