The change in phase if a wave is reflected from a rigid surface is

The change in phase, if a wave is reflected at a less dense surface, is

The change in phase, if a wave is reflected at a less dense surface, is

What will be the change in phase of wave due to reflection from rigid support?

Considering suitable examples, discuss the phase change when a wave is reflected from a rigid boundary.

What will be the change in phase of wave dueto reflection from free support?

Considering suitable examples, discuss the phase change when a wave is reflected from a free or open boundary.

When a light wave in a rarer medium is reflected from the surface of an optically denser medium, it suffers a phase change of (in radian)