Question

When a wave undergoes reflection at a denser medium, what happens to its phase?

Answer 1

1. When a wave undergoes reflection from a denser medium, the wave reverses its direction and amplitude.

2. Hence, with respect to the time, there is a change in the phase of $\mathrm{\pi }$ $radians.$

Therefore, when a wave reflects from a denser medium, its phase changes by $\mathrm{\pi }$ $radians$.