If a wave from one slit of a Young's double-slit set-up arrives at a point on the screen one wavelength behind the wave from the other slit,what is observed at that point?
A)dark fringe
B)bright fringe
C)multi-colored fringe
D)gray fringe,neither dark nor bright

Question

Quizplus · Accepted Answer

When a wave from one slit arrives at a point on the screen one wavelength behind the wave from the other slit, constructive interference occurs, resulting in a bright fringe. This is because the waves are in phase at that point, reinforcing each other's amplitude.

If a Wave from One Slit of a Young's Double-Slit