Question

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

Answer 1

When a wave undergoes a reflection at a denser medium then it's crest reflected as trough and vice versa. So, it's phase changes at 180(degree).

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Answer 2

Given that,

When a wave undergoes reflection at a denser medium.

We know that,

Phase difference :  

Phase difference is defined as the difference of phase angle between two waves.

When a wave moves air medium to denser medium then the wave reflect by the denser medium.

Then the phase difference between incidence and reflected wave is 180°.

Hence, When a wave undergoes reflection at a denser medium then the phase difference is 180°