What is the formula for the fringe width in a double-slit experiment?

What is the formula for the fringe width in a double-slit experiment?

Step 1: Understand that the double-slit experiment creates patterns of light and dark bands called fringes on a screen.
Step 2: Know that the fringe width is the distance between two adjacent bright or dark fringes.
Step 3: Identify the variables in the formula: λ (lambda) is the wavelength of the light used, D is the distance from the slits to the screen, and d is the distance between the two slits.
Step 4: The formula for fringe width (β) is β = λD/d.
Step 5: Use this formula to calculate the fringe width if you know the values of λ, D, and d.

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