Topic explanation

Standard explanation

Fringe spacing is the distance between successive bright fringes or successive dark fringes in Young’s double-slit interference pattern.

Key points

• distance = β/2
• β=λD/d
• Dependence: For bright fringes: y_n=nλD/d Next bright fringe: y₍n+1)=(n+1)λD/d Therefore fringe spa
• Bright-to-Nearest-Dark Distance: Since dark fringes lie halfway between bright fringes: distance = β/2
• Fringe spacing is constant in the ideal small-angle double-slit pattern.

Labelled diagram