Light of wavelength $λ$ is emitted from two point sources $R$ and $S$ and falls onto a distant screen.
At point $P$ on the screen, the light intensity is zero.
What could explain the zero intensity at $P$?
1 )
Light from the two sources is emitted 180° out of phase and the path difference to $P$ is $\frac{1}{2}\lambda$.
2 )
Light from the two sources is emitted in phase and the path difference to $P$ is $λ$.
3 )
Light from the two sources is emitted 90° out of phase and the path difference to $P$ is $λ$.
Light from the two sources is emitted in phase and the path difference to $P$ is $\frac{1}{2}\lambda$.
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