When does the wave propagating from one medium to another gets partially reflection and partially transmitted?

When does the wave propagating from one medium to another gets partially reflection and partially transmitted? Correct Answer Both mediums have different electrical properties

When a radio wave propagating in one medium impinges upon another medium having different electrical properties. The wave is partially reflected and partially transmitted.

Related Questions

Statement I: Due to diffused or irregular reflection of light, a closed room gets light even if no direct sunlight falls inside the room. Statement II: Irregular reflection, where the reflected rays are not parallel, does not follow the laws of reflection.
Statement I Due to diffused or irregular reflection of light, a closed room gets light even if no direct sunlight falls inside the room.
Statement II Irregular reflection, where the reflected rays are not parallel, does not follow the laws of reflection.