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

Question

Quizplus · Accepted Answer

When the waves from two slits are out of phase (one-half wavelength apart), they cancel each other out and produce a dark fringe on the screen.

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