Question

What is the phase difference for constructive interference?

Options

• \[\phi=2n\pi\]

• \[\phi=\left(n+\frac{1}{2}\right)\lambda\]

• \[\phi=(2n+1)\pi\]

• \[\phi=n\lambda\]

Answer 1

Constructive interference has phase difference \[\phi=2n\pi\]. At these points, the waves meet in the same phase and their amplitudes reinforce each other.