The fringe width is doubled because fringe width ‘ẞ’ is directly proportional to the
distance of separation ‘D’ between the slits and screen.
Class 12 Physics Chapter 10 Wave Optics Session 2024-2025.
How does the fringe width in Young’s double-slit experiment change when the distance of separation ‘D’ between the slits and screen is doubled?
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In Young’s double-slit experiment, fringe width (w) is directly proportional to the distance (D) between the slits and the screen, given by w = λD/d . When D is doubled, the fringe width also doubles.
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